[PATCH] xfstests: fix fsstress usage() output

[Rich Johnston]

This has ben commited.

Thanks
--Rich

commit 073841a774d669973283df2e06484e070e45b9f5
Author: Eric Sandeen <sandeen at redhat.com>
Date:   Mon Sep 16 22:00:37 2013 +0000

     xfstests: fix fsstress usage() output