playlist: showPlaylist() and shufflePlaylist() cannot fail

Make them both return void.

src/command.c

@@ -437,13 +437,15 @@ static int handleDeleteId(int fd, mpd_unused int *permission,
 static int handlePlaylist(int fd, mpd_unused int *permission,
 			  mpd_unused int argc, mpd_unused char *argv[])
 {
-	return showPlaylist(fd);
+	showPlaylist(fd);
+	return 0;
 }
 
 static int handleShuffle(int fd, mpd_unused int *permission,
 			 mpd_unused int argc, mpd_unused char *argv[])
 {
-	return shufflePlaylist(fd);
+	shufflePlaylist(fd);
+	return 0;
 }
 
 static int handleClear(mpd_unused int fd, mpd_unused int *permission,

src/playlist.c

@@ -217,7 +217,7 @@ int clearStoredPlaylist(int fd, const char *utf8file)
 	return removeAllFromStoredPlaylistByPath(fd, utf8file);
 }
 
-int showPlaylist(int fd)
+void showPlaylist(int fd)
 {
 	int i;
 	char path_max_tmp[MPD_PATH_MAX];
@@ -226,8 +226,6 @@ int showPlaylist(int fd)
 		fdprintf(fd, "%i:%s\n", i,
 		         get_song_url(path_max_tmp, playlist.songs[i]));
 	}
-
-	return 0;
 }
 
 void savePlaylistState(FILE *fp)
@@ -1224,7 +1222,7 @@ void previousSongInPlaylist(void)
 	}
 }
 
-int shufflePlaylist(mpd_unused int fd)
+void shufflePlaylist(mpd_unused int fd)
 {
 	int i;
 	int ri;
@@ -1253,8 +1251,6 @@ int shufflePlaylist(mpd_unused int fd)
 
 		incrPlaylistVersion();
 	}
-
-	return 0;
 }
 
 int deletePlaylist(int fd, const char *utf8file)

src/playlist.h

@@ -61,7 +61,7 @@ int addToStoredPlaylist(int fd, const char *file, const char *utf8file);
 
 int addSongToPlaylist(int fd, Song * song, int *added_id);
 
-int showPlaylist(int fd);
+void showPlaylist(int fd);
 
 int deleteFromPlaylist(int fd, int song);
 
@@ -83,7 +83,7 @@ void syncPlayerAndPlaylist(void);
 
 void previousSongInPlaylist(void);
 
-int shufflePlaylist(int fd);
+void shufflePlaylist(int fd);
 
 int savePlaylist(int fd, const char *utf8file);