coverity#704988 Dereference after null check

Change-Id: I641f9cf087cb2cd7f26daa70c886f174a8404ba9
diff --git a/sw/source/filter/html/swhtml.cxx b/sw/source/filter/html/swhtml.cxx
index 4ac0378..1bc33ef 100644
--- a/sw/source/filter/html/swhtml.cxx
+++ b/sw/source/filter/html/swhtml.cxx
@@ -906,7 +906,7 @@ void SwHTMLParser::Modify( const SfxPoolItem* pOld, const SfxPoolItem *pNew )
    switch( pOld ? pOld->Which() : pNew ? pNew->Which() : 0 )
    {
    case RES_OBJECTDYING:
        if( ((SwPtrMsgPoolItem *)pOld)->pObject == GetRegisteredIn() )
        if (pOld && ((SwPtrMsgPoolItem *)pOld)->pObject == GetRegisteredIn())
        {
            // dann uns selbst beenden
            GetRegisteredInNonConst()->Remove( this );