Removing an ACL can return an error. Propagate it.

SGI-PV: 980084
SGI-Modid: xfs-linux-melb:xfs-kern:30793a
Signed-off-by: NDavid Chinner <dgc@sgi.com>
Signed-off-by: NNiv Sardi <xaiki@sgi.com>
Signed-off-by: NLachlan McIlroy <lachlan@sgi.com>