fix audio deadlock

James Zipperer

Close the audio device before waiting for the audio thread to complete, which fixes a situation where the audio thread never completes

Add an additional check in the audio thread to see if the device is enabled and bail out if the device is no longer enabled

src/audio/SDL_audio.c

@@ -1051,6 +1051,10 @@ close_audio_device(SDL_AudioDevice * device)
 {
     SDL_AtomicSet(&device->shutdown, 1);
     SDL_AtomicSet(&device->enabled, 0);
+
+    if (device->hidden != NULL) {
+        current_audio.impl.CloseDevice(device);
+    }
     if (device->thread != NULL) {
         SDL_WaitThread(device->thread, NULL);
     }
@@ -1061,9 +1065,6 @@ close_audio_device(SDL_AudioDevice * device)
     if (device->convert.needed) {
         SDL_free(device->convert.buf);
     }
-    if (device->hidden != NULL) {
-        current_audio.impl.CloseDevice(device);
-    }
 
     free_audio_queue(device->buffer_queue_head);
     free_audio_queue(device->buffer_queue_pool);