tdf#89783: MM fixes potential endless loops with dbgutil build

Change-Id: I0eeb0decab588d89881a24983eb89727c3d9151b
Reviewed-on: https://gerrit.libreoffice.org/15561Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>
Tested-by: Katarina Behrens <Katarina.Behrens@cib.de>

sw/source/core/layout/frmtool.cxx

@@ -1006,7 +1006,7 @@ void AppendObjs( const SwFrmFmts *pTbl, sal_uLong nIndex,
     (void) pTbl;
 #if OSL_DEBUG_LEVEL > 0
     std::list<SwFrmFmt*> checkFmts;
-    for ( sal_uInt16 i = 0; i < pTbl->size(); ++i )
+    for ( size_t i = 0; i < pTbl->size(); ++i )
     {
         SwFrmFmt *pFmt = (*pTbl)[i];
         const SwFmtAnchor &rAnch = pFmt->GetAnchor();