output/Control: move two AudioOutput methods to Finish.cxx

src/output/Control.cxx

@@ -342,13 +342,6 @@ AudioOutputControl::StopThread() noexcept
 }
 
 void
-AudioOutput::BeginDestroy() noexcept
-{
-	if (mixer != nullptr)
-		mixer_auto_close(mixer);
-}
-
-void
 AudioOutputControl::BeginDestroy() noexcept
 {
 	output->BeginDestroy();
@@ -360,12 +353,6 @@ AudioOutputControl::BeginDestroy() noexcept
 }
 
 void
-AudioOutput::FinishDestroy() noexcept
-{
-	audio_output_free(this);
-}
-
-void
 AudioOutputControl::FinishDestroy() noexcept
 {
 	if (thread.IsDefined())

src/output/Finish.cxx

@@ -40,3 +40,16 @@ audio_output_free(AudioOutput *ao) noexcept
 {
 	ao_plugin_finish(ao);
 }
+
+void
+AudioOutput::BeginDestroy() noexcept
+{
+	if (mixer != nullptr)
+		mixer_auto_close(mixer);
+}
+
+void
+AudioOutput::FinishDestroy() noexcept
+{
+	audio_output_free(this);
+}