ofz#6390 Leak

Change-Id: Icc2b90ac062da32c9da4cce67f15f6e55e005c2b
Reviewed-on: https://gerrit.libreoffice.org/49842Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

filter/source/msfilter/msdffimp.cxx

@@ -4137,6 +4137,8 @@ SdrObject* SvxMSDffManager::ImportGroup( const DffRecordHeader& rHd, SvStream& r
                             if (nShapeId)
                                 insertShapeId(nShapeId, pTmp);
                         }
+                        else
+                            SdrObject::Free(pTmp);
                     }
                 }
                 if (!aRecHd2.SeekToEndOfRecord(rSt))