clang bugprone-unused-return-value

most of these changes just make the change of ownership when using
std::unique_ptr clearer, but there is one definite leak fix in
    PlainTextFilterDetect::detect

Change-Id: I8282a68007222a4fee84004f394bde0cca8569e9
Reviewed-on: https://gerrit.libreoffice.org/60159
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>

basctl/source/basicide/bastype2.cxx

@@ -701,9 +701,8 @@ SvTreeListEntry* TreeListBox::AddEntry(
 {
     SvTreeListEntry* p = InsertEntry(
         rText, rImage, rImage, pParent, bChildrenOnDemand, TREELIST_APPEND,
-        aUserData.get()
+        aUserData.release()
     );
-    aUserData.release();
     return p;
 }
 

binaryurp/source/reader.cxx

@@ -335,9 +335,8 @@ void Reader::readMessage(Unmarshal & unmarshal) {
             bridge_->incrementActiveCalls();
         }
         uno_threadpool_putJob(
-            bridge_->getThreadPool(), tid.getHandle(), req.get(), &request,
+            bridge_->getThreadPool(), tid.getHandle(), req.release(), &request,
             !synchronous);
-        req.release();
     }
 }
 
@@ -443,9 +442,8 @@ void Reader::readReplyMessage(Unmarshal & unmarshal, sal_uInt8 flags1) {
             std::unique_ptr< IncomingReply > resp(
                 new IncomingReply(exc, ret, outArgs));
             uno_threadpool_putJob(
-                bridge_->getThreadPool(), tid.getHandle(), resp.get(), nullptr,
+                bridge_->getThreadPool(), tid.getHandle(), resp.release(), nullptr,
                 false);
-            resp.release();
             break;
         }
     case OutgoingRequest::KIND_REQUEST_CHANGE:

codemaker/source/javamaker/javatype.cxx

@@ -764,8 +764,7 @@ void handleEnumType(
             std::unique_ptr< ClassFile::Code > blockCode(cf->newCode());
             blockCode->instrGetstatic(className, pair.second, classDescriptor);
             blockCode->instrAreturn();
-            blocks.push_back(blockCode.get());
-            blockCode.release();
+            blocks.push_back(blockCode.release());
         }
         code->instrTableswitch(defCode.get(), min, blocks);
         for (ClassFile::Code *p : blocks)
@@ -783,8 +782,7 @@ void handleEnumType(
             std::unique_ptr< ClassFile::Code > blockCode(cf->newCode());
             blockCode->instrGetstatic(className, pair.second, classDescriptor);
             blockCode->instrAreturn();
-            blocks.emplace_back(pair.first, blockCode.get());
-            blockCode.release();
+            blocks.emplace_back(pair.first, blockCode.release());
         }
         code->instrLookupswitch(defCode.get(), blocks);
         for (const std::pair< sal_Int32, ClassFile::Code * >& pair : blocks)

filter/source/textfilterdetect/filterdetect.cxx

@@ -171,8 +171,7 @@ OUString SAL_CALL PlainTextFilterDetect::detect(uno::Sequence<beans::PropertyVal
             std::unique_ptr<SvMemoryStream> pDecompressedStream(new SvMemoryStream());
             if (aCodecGZ.AttemptDecompression(*pInStream, *pDecompressedStream))
             {
-                uno::Reference<io::XStream> xStreamDecompressed(new utl::OStreamWrapper(*pDecompressedStream));
-                pDecompressedStream.release();
+                uno::Reference<io::XStream> xStreamDecompressed(new utl::OStreamWrapper(std::move(pDecompressedStream)));
                 aMediaDesc[MediaDescriptor::PROP_STREAM()] <<= xStreamDecompressed;
                 aMediaDesc[MediaDescriptor::PROP_INPUTSTREAM()] <<= xStreamDecompressed->getInputStream();
                 OUString aURL = aMediaDesc.getUnpackedValueOrDefault(MediaDescriptor::PROP_URL(), OUString() );

package/source/zippackage/ZipPackageStream.cxx

@@ -727,10 +727,9 @@ bool ZipPackageStream::saveChild(
             if ( m_bRawStream )
                 xStream->skipBytes( m_nMagicalHackPos );
 
-            ZipOutputStream::setEntry(pTempEntry);
-            rZipOut.writeLOC(pTempEntry);
             // the entry is provided to the ZipOutputStream that will delete it
-            pAutoTempEntry.release();
+            ZipOutputStream::setEntry(pAutoTempEntry.release());
+            rZipOut.writeLOC(pTempEntry);
 
             uno::Sequence < sal_Int8 > aSeq ( n_ConstBufferSize );
             sal_Int32 nLength;
@@ -797,9 +796,8 @@ bool ZipPackageStream::saveChild(
 
         try
         {
-            ZipOutputStream::setEntry(pTempEntry);
             // the entry is provided to the ZipOutputStream that will delete it
-            pAutoTempEntry.release();
+            ZipOutputStream::setEntry(pAutoTempEntry.release());
 
             if (pTempEntry->nMethod == STORED)
             {

registry/source/regimpl.cxx

@@ -700,8 +700,7 @@ RegError ORegistry::openKey(RegKeyHandle hKey, const OUString& keyName,
         }
 
         std::unique_ptr< ORegKey > p(new ORegKey(path, this));
-        i = m_openKeyTable.insert(std::make_pair(path, p.get())).first;
-        p.release();
+        i = m_openKeyTable.insert(std::make_pair(path, p.release())).first;
     } else {
         i->second->acquire();
     }

sd/source/ui/tools/SdGlobalResourceContainer.cxx

@@ -99,7 +99,7 @@ void SdGlobalResourceContainer::AddResource (
         mpImpl->maResources.end(),
         pResource.get());
     if (iResource == mpImpl->maResources.end())
-        mpImpl->maResources.push_back(pResource.get());
+        mpImpl->maResources.push_back(pResource.release());
     else
     {
         // Because the given resource is a unique_ptr it is highly unlikely
@@ -107,9 +107,6 @@ void SdGlobalResourceContainer::AddResource (
         SAL_WARN ( "sd.tools",
             "SdGlobalResourceContainer:AddResource(): Resource added twice.");
     }
-    // We can not put the unique_ptr into the vector so we release the
-    // unique_ptr and document that we take ownership explicitly.
-    pResource.release();
 }
 
 void SdGlobalResourceContainer::AddResource (

sw/source/core/crsr/swcrsr.cxx

@@ -964,7 +964,7 @@ sal_uLong SwCursor::FindAll( SwFindParas& rParas,
     {
         // put cursor as copy of current into ring
         // chaining points always to first created, so forward
-        std::unique_ptr< SwCursor > pSav( Create( this ) ); // save the current cursor
+        SwCursor* pSav = Create( this ); // save the current cursor
 
         // if already outside of body text search from this position or start at
         // 1. base section
@@ -995,7 +995,6 @@ sal_uLong SwCursor::FindAll( SwFindParas& rParas,
                 DeleteMark();
             return 0;
         }
-        pSav.release();
 
         if( !( FindRanges::InSelAll & eFndRngs ))
         {
@@ -1021,7 +1020,7 @@ sal_uLong SwCursor::FindAll( SwFindParas& rParas,
     }
     else if( FindRanges::InSelAll & eFndRngs )
     {
-        std::unique_ptr< SwCursor> pSav( Create( this ) );    // save the current cursor
+        SwCursor* pSav = Create( this );    // save the current cursor
 
         const SwNode* pSttNd = ( FindRanges::InBodyOnly & eFndRngs )
                             ? rNds.GetEndOfContent().StartOfSectionNode()
@@ -1048,7 +1047,6 @@ sal_uLong SwCursor::FindAll( SwFindParas& rParas,
                 DeleteMark();
             return 0;
         }
-        pSav.release();
         while( GetNext() != this )
             delete GetNext();
 

ucb/source/ucp/webdav-neon/DAVSessionFactory.cxx

@@ -70,9 +70,8 @@ rtl::Reference< DAVSession > DAVSessionFactory::createDAVSession(
         std::unique_ptr< DAVSession > xElement(
             new NeonSession( this, inUri, rFlags, *m_xProxyDecider.get() ) );
 
-        aIt = m_aMap.emplace( inUri, xElement.get() ).first;
+        aIt = m_aMap.emplace( inUri, xElement.release() ).first;
         aIt->second->m_aContainerIt = aIt;
-        xElement.release();
         return aIt->second;
     }
     else if ( osl_atomic_increment( &aIt->second->m_nRefCount ) > 1 )