beacon/light/request: nicer trigger wait loop

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

beacon/light/request/scheduler.go

@@ -203,16 +203,14 @@ func (s *Scheduler) syncLoop() {
 		s.lock.Lock()
 		s.processRound()
 		s.lock.Unlock()
-	loop:
-		for {
-			select {
-			case stop := <-s.stopCh:
-				close(stop)
-				return
-			case <-s.triggerCh:
-				break loop
-			case <-s.testWaitCh:
-			}
+	for triggered := false; !triggered; {
+		select {
+		case stop := <-s.stopCh:
+			close(stop)
+			return
+		case <-s.triggerCh:
+			triggered = true
+		case <-s.testWaitCh:
 		}
 	}
 }