Theme Editor: Made parser recover memory on error

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26703 a1c6a512-1295-4272-9138-f99709370657

utils/themeeditor/skin_parser.c

@@ -78,7 +78,10 @@ struct skin_element* skin_parse(const char* document)
         *to_write = skin_parse_viewport(&cursor);
         last = *to_write;
         if(!last)
+        {
+            skin_free_tree(root); /* Clearing any memory already used */
             return NULL;
+        }
 
         /* Making sure last is at the end */
         while(last->next)