Fix usage of unbuffered channel in signal.Notify

cmd/radiod/radiod.go

@@ -142,7 +142,7 @@ func main() {
 
 	// Set up a clean shutdown function on SIGTERM that will
 	// cancel the controlling Context.
-	sigCh := make(chan os.Signal)
+	sigCh := make(chan os.Signal, 1)
 	go func() {
 		<-sigCh
 		log.Printf("terminating due to signal...")