lcl_checkFrameBtlr: use SwTxtNode::GetTxtAttrAt

... which also finds the hint if it's not the first one in the array.

Change-Id: I5ff61305bcc896de0269c5bf47b237dce00142c4

sw/source/filter/ww8/docxattributeoutput.cxx

@@ -324,7 +324,7 @@ bool lcl_checkFrameBtlr(SwNode* pStartNode, sax_fastparser::FastAttributeList* p
     if (!pTxtNode->HasHints())
         return false;
 
-    SwTxtAttr* pTxtAttr = pTxtNode->GetSwpHints().GetStart(0);
+    SwTxtAttr* pTxtAttr = pTxtNode->GetTxtAttrAt(0, RES_TXTATR_AUTOFMT);
 
     if (!pTxtAttr || pTxtAttr->Which() != RES_TXTATR_AUTOFMT)
         return false;