fix crash on loading ooo32089-1.sxw

regression from

"
commit 11c94c17
SwDoc::DelLayoutFmt: don't delete content of a draw format

In case a shape (has a draw format) has a textbox (RES_CNTNT of the draw
format), then that's just a pointer to that content, but the draw format
doesn't own it: the matching fly format does. So ignore that content
when deleting the layout format in case of draw formats: that ensures
when both the draw and the fly format is deleted, deletion is only
performed once.
"

Change-Id: Id374c6afe66eb0bd665c442ba8d1dc7e39679555

sw/source/core/doc/doclay.cxx

@@ -262,8 +262,8 @@ void SwDoc::DelLayoutFmt( SwFrmFmt *pFmt )
             // determine frame formats of at-frame anchored objects
             const SwNodeIndex* pCntntIdx = 0;
             if (pFmt->Which() != RES_DRAWFRMFMT)
-                pFmt->GetCntnt().GetCntntIdx();
-            if ( pCntntIdx )
+                pCntntIdx = pFmt->GetCntnt().GetCntntIdx();
+            if (pCntntIdx)
             {
                 const SwFrmFmts* pTbl = pFmt->GetDoc()->GetSpzFrmFmts();
                 if ( pTbl )