[lint] minor fix

Author: capcom6

internal/sms-gateway/modules/sse/service.go

@@ -134,11 +134,14 @@ func (s *Service) handleStream(deviceID string, w *bufio.Writer) {
 	conn := s.registerConnection(deviceID)
 	defer s.removeConnection(deviceID, conn.id)
 
+	var tickerChan <-chan time.Time
+
 	// Conditionally create ticker
-	var ticker *time.Ticker
 	if s.config.keepAlivePeriod > 0 {
-		ticker = time.NewTicker(s.config.keepAlivePeriod)
+		ticker := time.NewTicker(s.config.keepAlivePeriod)
 		defer ticker.Stop()
+
+		tickerChan = ticker.C
 	}
 
 	for {
@@ -154,13 +157,7 @@ func (s *Service) handleStream(deviceID string, w *bufio.Writer) {
 				}
 			})
 		// Conditionally handle ticker events
-		case <-func() <-chan time.Time {
-			if ticker != nil {
-				return ticker.C
-			}
-			// Return nil channel that never fires when disabled
-			return make(chan time.Time)
-		}():
+		case <-tickerChan:
 			if err := s.writeToStream(w, ":keepalive"); err != nil {
 				s.logger.Warn("Failed to write keepalive",
 					zap.String("device_id", deviceID),