Open tone-test output before transmission

client.go

@@ -56,12 +56,8 @@ func (b *Barnard) connect(reconnect bool) bool {
 		// --- Tone test mode: skip all OpenAL; generate 440 Hz tone
 		// --- and save incoming audio to a file.
 
-		// Start the tone generator goroutine.
-		b.toneTestStop = make(chan struct{})
-		go StartToneGenerator(b.Client, b.toneTestStop)
-		b.Tx = true
-
-		// Attach the audio file saver.
+		// Open the output first. Starting transmission before this succeeds
+		// leaves an orphaned tone goroutine when the path is unusable.
 		saver, err := NewAudioFileSaver(b.ToneTestOutput)
 		if err != nil {
 			b.exitWithError(err)
@@ -70,6 +66,10 @@ func (b *Barnard) connect(reconnect bool) bool {
 		b.toneTestSaver = saver
 		b.Client.Config.AttachAudio(saver)
 
+		b.toneTestStop = make(chan struct{})
+		go StartToneGenerator(b.Client, b.toneTestStop)
+		b.Tx = true
+
 		b.Connected = true
 		return true
 	}