There is a possible memory leak..

            translated_name = g_strdup(xfce_rc_read_entry(themefile, "Name", file));
            xfce_rc_close(themefile);
            themename = g_path_get_basename (file);
            if(g_hash_table_lookup(theme_names, themename))
            {
                g_free(themename);
                continue;
            }

This bug was detected with cppcheck