cid#1500569 silence Explicit null dereferenced

likely silences it, an experiment

Change-Id: I095d2dad74331a08ed649cea9bef08b63f9ef1de
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/130279
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

sw/source/filter/ww8/wrtww8.cxx

@@ -3742,7 +3742,7 @@ ErrCode SwWW8Writer::WriteStorage()
 
     ErrCode nErrorCode = WriteStorageImpl();
 
-    if (xPackageEncryption.is())
+    if (xPackageEncryption)
     {
         m_pStg->Commit();
         pSotStorageStream->Seek(0);