Flush PulseAudio stream on overflow (fix #5464)

(cherry picked from commit 836d970806b986949b9b2f847d16cf73f8bdadca)

Conflicts:

	modules/audio_output/pulse.c

modules/audio_output/pulse.c

@@ -313,9 +313,13 @@ static void stream_moved_cb(pa_stream *s, void *userdata)
 static void stream_overflow_cb(pa_stream *s, void *userdata)
 {
     aout_instance_t *aout = userdata;
+    pa_operation *op;
 
-    msg_Err(aout, "overflow");
-    (void) s;
+    msg_Err(aout, "overflow, flushing");
+    op = pa_stream_flush(s, NULL, NULL);
+    if (likely(op != NULL))
+        pa_operation_unref(op);
+    stream_reset_sync(s, aout);
 }
 
 static void stream_started_cb(pa_stream *s, void *userdata)