Addition to Fix of bug #585, http://bugs.mariadb.com/show_bug.cgi?id=585

regexfilter.c:routeQuery called modutil_replace_SQL which resulted in multiple buffers in query GWBUF. Those weren't handled properly later. Added call for gwbug_make_contiguous.

server/modules/filter/regexfilter.c

@@ -315,6 +315,7 @@ int		length;
 		if (newsql)
 		{
 			queue = modutil_replace_SQL(queue, newsql);
+			queue = gwbuf_make_contiguous(queue);
 			free(newsql);
 			my_session->replacements++;
 		}