auhal: do not destroy "audio-device" when AudioHardwarePropertyListener...

auhal: do not destroy "audio-device" when AudioHardwarePropertyListener failed, but try to use it anyway.

It allows multiple Safari webplugins to play audio at the sametime, just as 2 vlc instances would do.

modules/audio_output/auhal.c

@@ -1051,7 +1051,7 @@ static void Probe( aout_instance_t * p_aout )
     return;
 
 error:
-    var_Destroy( p_aout, "audio-device" );
+    msg_Warn( p_aout, "audio device already initialized" );
     free( p_devices );
     return;
 }