avoid hang in certain ww6 docs

Change-Id: Ife15f6a6e4b31c6e226a154dd708290266e86a2e
(cherry picked from commit d0813b43)
Reviewed-on: https://gerrit.libreoffice.org/17911Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>

sw/source/filter/ww8/ww8par.cxx

@@ -3881,7 +3881,7 @@ void SwWW8ImplReader::ReadAttrs(WW8_CP& rTextPos, WW8_CP& rNext, long nTextEnd,
         {
             m_aCurrAttrCP = rTextPos;
             rNext = ReadTextAttr(rTextPos, nTextEnd, rbStartLine);
-            if (rTextPos == rNext && rTextPos == WW8_CP_MAX)
+            if (rTextPos == rNext && rTextPos >= nTextEnd)
                 break;
         }
         while( rTextPos >= rNext );