Add a wrapping div around nav in a Genesis child theme

genesis-add-nav-div.php

remove_action('genesis_before_header', 'genesis_do_nav');
add_action('genesis_before_header', 'custom_genesis_do_nav');
function custom_genesis_do_nav() {
    printf( '<div id="nav-wrap">' );
    $nav = wp_nav_menu(array(
        'theme_location' => 'primary',
        'menu' => 29,
        'container' => '',
        'menu_class' => genesis_get_option('nav_superfish') ? 'nav superfish' : 'nav',
        'echo' => 0
    ));
    printf( '<div id="nav"><div class="wrap">%s</div></div>', $nav );
    printf( '</div>' );
    }