coverity#736009 Explicit null dereferenced

Change-Id: If6ae3637f901ed8d424125c19e04f64c3a27c126
Reviewed-on: https://gerrit.libreoffice.org/2325Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

xmloff/source/draw/xexptran.cxx

@@ -1610,7 +1610,7 @@ void SdXMLImExSvgDElement::AddPolygon(
 
         for(sal_Int32 a(0L); a < nCnt; a++)
         {
-            if(!pFlags || drawing::PolygonFlags_CONTROL != *pFlagArray)
+            if(!pFlags || drawing::PolygonFlags_CONTROL != *pFlagArray++)
             {
                 bool bDidWriteAsCurve(false);
 
@@ -2093,7 +2093,6 @@ void SdXMLImExSvgDElement::AddPolygon(
 
             // next point
             pPointArray++;
-            pFlagArray++;
         }
 
         // close path if closed poly