Do not reconnect if connection was refused

Otherwise, it will try to reconnect recursively

src/util/audio_backend.cpp

@@ -99,6 +99,7 @@ void AudioBackend::contextStateCb(pa_context* c, void* data) {
                            nullptr, nullptr);
       break;
     case PA_CONTEXT_FAILED:
+      if (pa_context_errno(c) != PA_ERR_CONNECTIONREFUSED) {
         // When pulseaudio server restarts, the connection is "failed". Try to reconnect.
         // pa_threaded_mainloop_lock is already acquired in callback threads.
         // So there is no need to lock it again.
@@ -108,6 +109,7 @@ void AudioBackend::contextStateCb(pa_context* c, void* data) {
           backend->context_ = nullptr;
         }
         backend->connectContext();
+      }
       break;
     case PA_CONTEXT_CONNECTING:
     case PA_CONTEXT_AUTHORIZING: