coverity#735849 Unchecked dynamic_cast

Change-Id: Ia8f6b24db5d83337d56599214d0acdb9b144cfc3

sfx2/source/doc/objitem.cxx

@@ -88,12 +88,10 @@ SfxObjectItem::SfxObjectItem( sal_uInt16 nWhichId, SfxShell *pSh )
 
 bool SfxObjectItem::operator==( const SfxPoolItem &rItem ) const
 {
-     const SfxObjectItem *pOther = dynamic_cast<const SfxObjectItem*>( &rItem );
-     return pOther->_pSh == _pSh;
+     const SfxObjectItem& rOther = dynamic_cast<const SfxObjectItem&>(rItem);
+     return rOther._pSh == _pSh;
 }
 
-
-
 SfxPoolItem* SfxObjectItem::Clone( SfxItemPool *) const
 {
     return new SfxObjectItem( Which(), _pSh );