tdf#120703 (PVS): redundant nullptr check

V668 There is no sense in testing the 'pDest' pointer against null, as the
     memory was allocated using the 'new' operator. The exception will be
     generated in the case of memory allocation error.

Change-Id: I17773f92ed73359e925ad779d171ec99727f7905
Reviewed-on: https://gerrit.libreoffice.org/62133
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

svx/source/xml/xmlgrhlp.cxx

@@ -331,7 +331,7 @@ Graphic SvXMLGraphicOutputStream::GetGraphic()
                     mpOStm->Seek( 0 );
                     aZCodec.Decompress( *mpOStm, *pDest );
 
-                    if (aZCodec.EndCompression() && pDest )
+                    if (aZCodec.EndCompression())
                     {
                         sal_uIntPtr nStreamLen_ = pDest->TellEnd();
                         if (nStreamLen_)