b727a6a8eff0b97d5fb9e95cb5
author Chris Mason <chris.mason@oracle.com> 1263778578 -0500
committer Chris Mason <chris.mason@oracle.com> 1263778822 -0500

Btrfs: deal with NULL acl sent to btrfs_set_acl

It is legal for btrfs_set_acl to be sent a NULL acl.  This
makes sure we don't dereference it.  A similar patch was sent by
Johannes Hirte <johannes.hirte@fem.tu-ilmenau.de>

Signed-off-by: Chris Mason <chris.mason@oracle.com>
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