output/{recorder,httpd,shout}: use std::unique_ptr to manage PreparedEncoder pointer

src/output/plugins/httpd/HttpdInternal.hxx

@@ -39,6 +39,7 @@
 
 #include <queue>
 #include <list>
+#include <memory>
 
 struct ConfigBlock;
 class EventLoop;
@@ -60,7 +61,7 @@ class HttpdOutput final : AudioOutput, ServerSocket {
 	/**
 	 * The configured encoder plugin.
 	 */
-	PreparedEncoder *prepared_encoder = nullptr;
+	std::unique_ptr<PreparedEncoder> prepared_encoder;
 	Encoder *encoder = nullptr;
 
 	/**
@@ -152,7 +153,6 @@ private:
 
 public:
 	HttpdOutput(EventLoop &_loop, const ConfigBlock &block);
-	~HttpdOutput();
 
 	static AudioOutput *Create(EventLoop &event_loop,
 				   const ConfigBlock &block) {

src/output/plugins/httpd/HttpdOutputPlugin.cxx

@@ -79,7 +79,7 @@ HttpdOutput::HttpdOutput(EventLoop &_loop, const ConfigBlock &block)
 
 	/* initialize encoder */
 
-	prepared_encoder = encoder_init(*encoder_plugin, block);
+	prepared_encoder.reset(encoder_init(*encoder_plugin, block));
 
 	/* determine content type */
 	content_type = prepared_encoder->GetMimeType();
@@ -87,11 +87,6 @@ HttpdOutput::HttpdOutput(EventLoop &_loop, const ConfigBlock &block)
 		content_type = "application/octet-stream";
 }
 
-HttpdOutput::~HttpdOutput()
-{
-	delete prepared_encoder;
-}
-
 inline void
 HttpdOutput::Bind()
 {