Btrfs: remove ->{get, set}_acl() from btrfs_dir_ro_inode_operations

Subvolume directory inodes can't have ACLs.

Cc: <stable@vger.kernel.org> # 4.9.x
Signed-off-by: NOmar Sandoval <osandov@fb.com>
Reviewed-by: NDavid Sterba <dsterba@suse.com>
Signed-off-by: NChris Mason <clm@fb.com>

fs/btrfs/inode.c

@@ -10592,8 +10592,6 @@ static const struct inode_operations btrfs_dir_inode_operations = {
 static const struct inode_operations btrfs_dir_ro_inode_operations = {
 	.lookup		= btrfs_lookup,
 	.permission	= btrfs_permission,
-	.get_acl	= btrfs_get_acl,
-	.set_acl	= btrfs_set_acl,
 	.update_time	= btrfs_update_time,
 };