[PATCH] no more flush_workqueue in xfs

I see you just applied my patch to make destroy_workqueue do the
flush.  Fix up XFS for it.

fs/xfs/pagebuf/page_buf.c

@@ -1873,7 +1873,6 @@ STATIC void
 pagebuf_daemon_stop(void)
 {
 	if (pb_daemon) {
-		flush_workqueue(pagebuf_workqueue);
 		destroy_workqueue(pagebuf_workqueue);
 
 		pb_daemon->active = 0;