playlist/{flac,m3u}: use std::make_unique

src/playlist/MemorySongEnumerator.cxx

@@ -26,7 +26,7 @@ MemorySongEnumerator::NextSong()
 	if (songs.empty())
 		return nullptr;
 
-	std::unique_ptr<DetachedSong> result(new DetachedSong(std::move(songs.front())));
+	auto result = std::make_unique<DetachedSong>(std::move(songs.front()));
 	songs.pop_front();
 	return result;
 }

src/playlist/cue/CueParser.cxx

@@ -229,7 +229,7 @@ CueParser::Feed2(char *p) noexcept
 		}
 
 		state = TRACK;
-		current.reset(new DetachedSong(filename));
+		current = std::make_unique<DetachedSong>(filename);
 		assert(!current->GetTag().IsDefined());
 
 		song_tag = header_tag;

src/playlist/plugins/ExtM3uPlaylistPlugin.cxx

@@ -135,7 +135,7 @@ ExtM3uPlaylist::NextSong()
 		line_s = StripLeft(line_s);
 	} while (line_s[0] == '#' || *line_s == 0);
 
-	return std::unique_ptr<DetachedSong>(new DetachedSong(line_s, std::move(tag)));
+	return std::make_unique<DetachedSong>(line_s, std::move(tag));
 }
 
 static const char *const extm3u_suffixes[] = {

src/playlist/plugins/FlacPlaylistPlugin.cxx

@@ -80,7 +80,7 @@ FlacPlaylist::NextSong()
 		? c.tracks[next_track].offset
 		: total_samples;
 
-	std::unique_ptr<DetachedSong> song(new DetachedSong(uri));
+	auto song = std::make_unique<DetachedSong>(uri);
 	song->SetStartTime(SongTime::FromScale(start, sample_rate));
 	song->SetEndTime(SongTime::FromScale(end, sample_rate));
 	return song;

src/playlist/plugins/M3uPlaylistPlugin.cxx

@@ -55,7 +55,7 @@ M3uPlaylist::NextSong()
 		line_s = Strip(line_s);
 	} while (line_s[0] == '#' || *line_s == 0);
 
-	return std::unique_ptr<DetachedSong>(new DetachedSong(line_s));
+	return std::make_unique<DetachedSong>(line_s);
 }
 
 static const char *const m3u_suffixes[] = {