sdl_audio: Drain queue completely when backed up.

Author: squidbus

src/core/libraries/audio/sdl_audio.cpp

@@ -71,7 +71,7 @@ class SDLPortBackend : public PortBackend {
         // stalling just in case. Otherwise, latency may grow over time unbounded.
         if (SDL_GetAudioStreamQueued(stream) >= queue_threshold) {
             LOG_WARNING(Lib_AudioOut, "SDL audio queue backed up, draining.");
-            while (SDL_GetAudioStreamQueued(stream) >= queue_threshold) {
+            while (SDL_GetAudioStreamQueued(stream)) {
                 SDL_FlushAudioStream(stream);
                 std::this_thread::yield();
             }