output/recorder: move encoder_finish() call to destructor

src/output/plugins/RecorderOutputPlugin.cxx

@@ -56,8 +56,14 @@ struct RecorderOutput {
 
 	RecorderOutput()
 		:base(recorder_output_plugin),
+		 encoder(nullptr),
 		 path(AllocatedPath::Null()) {}
 
+	~RecorderOutput() {
+		if (encoder != nullptr)
+			encoder_finish(encoder);
+	}
+
 	bool Initialize(const config_param &param, Error &error_r) {
 		return base.Configure(param, error_r);
 	}
@@ -133,15 +139,6 @@ RecorderOutput::Create(const config_param &param, Error &error)
 	return recorder;
 }
 
-static void
-recorder_output_finish(AudioOutput *ao)
-{
-	RecorderOutput *recorder = (RecorderOutput *)ao;
-
-	encoder_finish(recorder->encoder);
-	delete recorder;
-}
-
 inline bool
 RecorderOutput::EncoderToFile(Error &error)
 {
@@ -241,7 +238,7 @@ const struct AudioOutputPlugin recorder_output_plugin = {
 	"recorder",
 	nullptr,
 	&Wrapper::Init,
-	recorder_output_finish,
+	&Wrapper::Finish,
 	nullptr,
 	nullptr,
 	&Wrapper::Open,