md: report failure if a 'set faulty' request doesn't.
Sometimes a device will refuse to be set faulty. e.g. RAID1 will never let the last working device become faulty. So check if "md_error()" did manage to set the faulty flag and fail with EBUSY if it didn't. Resolves-Debian-Bug: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=601198Reported-by: Mike Hommey <firstname.lastname@example.org> Signed-off-by: NeilBrown <email@example.com>
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