do not return any subkey if an authentication subkey is not found

diff --git a/lib/openpgp/pgp.c b/lib/openpgp/pgp.c
index 09402ebd59b64ec90650f970d13b1104d372e9e8..6ab31c1fa10441b7ae84bf0573b003d6d08525b0 100644 (file)
--- a/lib/openpgp/pgp.c
+++ b/lib/openpgp/pgp.c
@@ -1531,5 +1531,5 @@ int gnutls_openpgp_crt_get_auth_subkey( gnutls_openpgp_crt_t crt, gnutls_openpgp
         }
     }
 
-  return 0;
+  return GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE;
 }