Btrfs: handle ERR_PTR from posix_acl_from_xattr()
posix_acl_from_xattr() returns both ERR_PTRs and null, but it's OK to pass null values to set_cached_acl() Signed-off-by: NDan Carpenter <error27@gmail.com> Signed-off-by: NChris Mason <chris.mason@oracle.com>
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