Append HTML to an LI of wp_list_categories

I think this is the cleanest and WordPressiest way to do it:

<?php
$menu_args = array(
    'child_of' => '4',
    'title_li' => '',
    'link_after' => '&raquo;',
);
wp_list_categories($menu_args);
?>

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)