Cap queued audio at 40 ms on Steam Link

app/streaming/audio/renderers/sdlaud.cpp

@@ -87,6 +87,11 @@ void* SdlAudioRenderer::getAudioBuffer(int*)
 
 bool SdlAudioRenderer::submitAudio(int bytesWritten)
 {
+    if (bytesWritten == 0) {
+        // Nothing to do
+        return true;
+    }
+
     if (SDL_QueueAudio(m_AudioDevice, m_AudioBuffer, bytesWritten) < 0) {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                      "Failed to queue audio sample: %s",