events: immediate sync after xfer (if configured)

src/knot/zone/events.c

@@ -354,6 +354,10 @@ static int event_xfer(zone_t *zone)
 		zone_events_schedule(zone, ZONE_EVENT_EXPIRE,  soa_graceful_expire(soa));
 		zone_events_schedule(zone, ZONE_EVENT_REFRESH, knot_soa_refresh(soa));
 		zone_events_schedule(zone, ZONE_EVENT_NOTIFY,  ZONE_EVENT_NOW);
+		/* Sync zonefile immediately if configured. */
+		if (zone->conf->dbsync_timeout == 0) {
+			zone_events_schedule(zone, ZONE_EVENT_FLUSH, ZONE_EVENT_NOW);
+		}
 		zone->bootstrap_retry = ZONE_EVENT_NOW;
 		zone->flags &= ~ZONE_FORCE_AXFR;
 		/* Trim extra heap. */