kdc: Ensure that we emit a non-zero error code

If ‘r->error_code’ was zero, we would turn it into an ERR_GENERIC error
and return that to the client. Now we return the actual error code
instead.

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>

kdc/kerberos5.c

@@ -2760,7 +2760,7 @@ out:
 				 r->rep.padata,
 			         r->armor_crypto,
 			         &req->req_body,
-			         r->error_code,
+			         r->error_code ? r->error_code : ret,
 			         r->client_princ,
 			         r->server_princ,
 			         NULL, NULL,

kdc/krb5tgs.c

@@ -2178,7 +2178,7 @@ out:
 				 &error_method,
 				 r->armor_crypto,
 				 &req->req_body,
-				 r->error_code,
+				 r->error_code ? r->error_code : ret,
 				 r->client_princ,
 				 r->server_princ,
 				 csec, cusec,