playlist: PlaylistInfo() does not call commandError()

Continuing the effort of removing protocol specific calls from the
core libraries: let the command.c code call commandError() based on
PlaylistInfo's return value.

src/command.c

@@ -540,13 +540,25 @@ static int handleLoad(int fd, mpd_unused int *permission,
 static int handleListPlaylist(int fd, mpd_unused int *permission,
 			      mpd_unused int argc, char *argv[])
 {
-	return PlaylistInfo(fd, argv[1], 0);
+	int ret;
+
+	ret = PlaylistInfo(fd, argv[1], 0);
+	if (ret == -1)
+		commandError(fd, ACK_ERROR_NO_EXIST, "No such playlist");
+
+	return ret;
 }
 
 static int handleListPlaylistInfo(int fd, mpd_unused int *permission,
 				  mpd_unused int argc, char *argv[])
 {
-	return PlaylistInfo(fd, argv[1], 1);
+	int ret;
+
+	ret = PlaylistInfo(fd, argv[1], 1);
+	if (ret == -1)
+		commandError(fd, ACK_ERROR_NO_EXIST, "No such playlist");
+
+	return ret;
 }
 
 static int handleLsInfo(int fd, mpd_unused int *permission,

src/playlist.c

@@ -1342,11 +1342,8 @@ int PlaylistInfo(int fd, const char *utf8file, int detail)
 	ListNode *node;
 	List *list;
 
-	if (!(list = loadStoredPlaylist(utf8file))) {
-		commandError(fd, ACK_ERROR_NO_EXIST, "could not open playlist "
-		             "\"%s\": %s", utf8file, strerror(errno));
+	if (!(list = loadStoredPlaylist(utf8file)))
 		return -1;
-	}
 
 	node = list->firstNode;
 	while (node != NULL) {