playlist/cue/CueParser: Get() returns std::unique_ptr

src/playlist/cue/CueParser.cxx

@@ -281,7 +281,7 @@ CueParser::Finish()
 	end = true;
 }
 
-DetachedSong *
+std::unique_ptr<DetachedSong>
 CueParser::Get()
 {
 	if (finished == nullptr && end) {
@@ -293,5 +293,7 @@ CueParser::Get()
 		previous.reset();
 	}
 
-	return finished.release();
+	auto result = std::move(finished);
+	finished.reset();
+	return result;
 }

src/playlist/cue/CueParser.hxx

@@ -118,7 +118,7 @@ public:
 	 * @return a song object that must be freed by the caller, or NULL if
 	 * no song was finished at this time
 	 */
-	DetachedSong *Get();
+	std::unique_ptr<DetachedSong> Get();
 
 private:
 	gcc_pure