[systemd login] Handle ENODATA properly. Fixes JB#53297

Handle ENODATA similarly to ENOENT error. This is reported by systemd
when the data is not prepared yet. User change is monitored anyways, so
getting this error simply means that we do not quit the main loop just
yet and wait for the data to get ready to indicate what user is logged
in.

connman/src/systemd_login.c

@@ -447,7 +447,7 @@ static int get_session_uid_and_state(uid_t *uid,
 	err = sd_seat_get_active(DEFAULT_SEAT, &session, uid);
 	if (err < 0) {
 		/* No not regard -ENOENT as error, session is not ready yet */
-		if (err != -ENOENT)
+		if (err != -ENOENT && err != -ENODATA)
 			connman_warn("err %d failed to get active session "
 						"and/or user for seat %s", err,
 						DEFAULT_SEAT);
@@ -591,6 +591,10 @@ static int check_session_status(struct systemd_login_data *login_data)
 		/* Session is not proabably ready yet */
 		DBG("session not ready yet");
 		goto out;
+	case -ENODATA:
+		/* Session data is not ready yet */
+		DBG("session data is not prepared yet");
+		goto out;
 	default:
 		DBG("failed to get uid %u and/or state %d", uid, state);
 		err = -EINVAL;
@@ -752,6 +756,7 @@ static gboolean delayed_status_check(gpointer user_data)
 	case -EINPROGRESS:
 		break;
 	case -ENOENT:
+	case -ENODATA:
 		/* Session is not ready yet, keep in loop */
 		return G_SOURCE_CONTINUE;
 	default: