beacon/light/request: nicer trigger wait loop

Co-authored-by: Martin HS <martin@swende.se>

beacon/light/request/scheduler.go

@@ -203,18 +203,16 @@ func (s *Scheduler) syncLoop() {
 		s.lock.Lock()
 		s.processRound()
 		s.lock.Unlock()
-	loop:
-		for {
+	for triggered := false; !triggered; {
 		select {
 		case stop := <-s.stopCh:
 			close(stop)
 			return
 		case <-s.triggerCh:
-				break loop
+			triggered = true
 		case <-s.testWaitCh:
 		}
 	}
-	}
 }
 
 // targetChanged returns true if a registered target data structure has been