fix another ww6 crash

Change-Id: I47b4ffb1d96041d51dde313c080ed1d9cd4000be
(cherry picked from commit 64052037)
Reviewed-on: https://gerrit.libreoffice.org/17908Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>

sw/source/filter/ww8/ww8par2.cxx

@@ -4327,6 +4327,7 @@ void WW8RStyle::ImportOldFormatStyles()
         {
             rSt.SeekRel(cbPapx-nByteCount);
             nByteCount += cbPapx-nByteCount;
+            break;
         }
 
         sal_uInt8 cb(0);