cid#1608448 Data race condition

drop mutex, only allowed to be called from ctor

Change-Id: I1878cf368caacafdcee96a7112a6cc768ce87520
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/174207
Reviewed-by: Caolán McNamara <caolan.mcnamara@collabora.com>
Tested-by: Jenkins

filter/source/config/cache/basecontainer.cxx

@@ -45,13 +45,9 @@ void BaseContainer::init(const OUString&
                          const css::uno::Sequence< OUString >&                  lServiceNames      ,
                                FilterCache::EItemType                                  eType              )
 {
-    // SAFE ->
-    std::unique_lock aLock(m_aMutex);
-
     m_sImplementationName = sImplementationName;
     m_lServiceNames       = lServiceNames      ;
     m_eType               = eType              ;
-    // <- SAFE
 }