OutputThread: move code to CloseOutput()

src/output/Internal.hxx

@@ -382,6 +382,13 @@ private:
 	void Close(bool drain);
 	void Reopen();
 
+	/**
+	 * Close the output plugin.
+	 *
+	 * Mutex must not be locked.
+	 */
+	void CloseOutput(bool drain);
+
 	AudioFormat OpenFilter(AudioFormat &format, Error &error_r);
 
 	/**

src/output/OutputThread.cxx

@@ -251,12 +251,7 @@ AudioOutput::Close(bool drain)
 
 	mutex.unlock();
 
-	if (drain)
-		ao_plugin_drain(this);
-	else
-		ao_plugin_cancel(this);
-
-	ao_plugin_close(this);
+	CloseOutput(drain);
 	CloseFilter();
 
 	mutex.lock();
@@ -265,6 +260,17 @@ AudioOutput::Close(bool drain)
 		    plugin.name, name);
 }
 
+inline void
+AudioOutput::CloseOutput(bool drain)
+{
+	if (drain)
+		ao_plugin_drain(this);
+	else
+		ao_plugin_cancel(this);
+
+	ao_plugin_close(this);
+}
+
 void
 AudioOutput::ReopenFilter()
 {