libselinux: get_default_type now sets EINVAL if no

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

This patch looks good to me. acked.

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.11 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

iEYEARECAAYFAk7dHbgACgkQrlYvE4MpobMtLwCgy9f/Ptxvo8ef7gUXpV0QMAGZ FWAAn1DkhHGBYpaxIDHYE/LURjrTOPfq
=o6Oa
-----END PGP SIGNATURE-----