As 'nfs_acceptable' uses the authnetication user in it's checks, the
filehandle might not be truely "stale" - EACCES is safer.

Thanks Olaf Kirch <okir@suse.de> and others.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>