[PATCH] knfsd: nfsd4: acls: simplify nfs4_acl_nfsv4_to_posix interface

There's no need to handle the case where the caller passes in null for pacl or
dpacl; no caller does that, because it would be a dumb thing to do.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>