Playlist Fix failure to append default file name

FS#12992 - Can't create playlist with all tracks on device (regression)
references this issue

empty_playlist() only sets filename[0] = '\0'
the code was checking filename[1]..
bug ensued

strip extra leading '/' from default path

Change-Id: Ibd8973666ee45583b9e11e3ba317c0e247f085c1

apps/menus/playlist_menu.c

@@ -50,7 +50,7 @@ int save_playlist_screen(struct playlist_info* playlist)
     if (!dot)
     {
         /* folder of some type */
-        if (temp[1] != '\0')
+        if (len > 1)
             strcpy(&temp[len-1], ".m3u8");
         else
             snprintf(temp, sizeof(temp), "%s%s",

apps/playlist_catalog.c

@@ -86,6 +86,10 @@ static int initialize_catalog(void)
                 mkdir(playlist_dir);
         }
 
+        /* remove duplicate leading '/' */
+        if (playlist_dir[0] == '/' && playlist_dir[1] == '/')
+            strcpy(playlist_dir, &playlist_dir[1]);
+
         playlist_dir_length = strlen(playlist_dir);
 
         if (dir_exists(playlist_dir))