We have an optimization that will go ahead and cache no acls on an inode if
there are no xattrs on the inode.  This saves us a lookup later to check the
acls for writes or any other access.  The problem is I use selinux so I always
have an xattr on inodes, so make this test a little smarter and check for the
actual acl hash on the key and if it isn't there then we still get to cache no
acl which makes everybody who uses selinux a little happier.  Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>