Related: ofz#6390, similar pattern

Change-Id: I4be0c422a70e58832227fb8c5a082ecdc9573220
Reviewed-on: https://gerrit.libreoffice.org/49845Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

filter/source/msfilter/msdffimp.cxx

@@ -4120,6 +4120,8 @@ SdrObject* SvxMSDffManager::ImportGroup( const DffRecordHeader& rHd, SvStream& r
                             if (nShapeId)
                                 insertShapeId(nShapeId, pTmp);
                         }
+                        else
+                            SdrObject::Free(pTmp);
                     }
                 }
                 else if ( aRecHd2.nRecType == DFF_msofbtSpContainer )