Add search to primary menu in Genesis

functions.php

//* Add search to primary nav menu
add_filter( 'wp_nav_menu_items', 'add_search_primary_nav_menu', 10, 2 );
function add_search_primary_nav_menu( $menu, stdClass $args ){
        if ( 'primary' != $args->theme_location )
        	return $menu;       
               if( genesis_get_option( 'nav_extras' ) )
                return $menu;       
        $menu .= sprintf( '<li class="custom-search">%s</li>', __( genesis_search_form( $echo ) ) );  
        return $menu;    
}

//* Customize search form input box text
add_filter( 'genesis_search_text', 'edit_genesis_search_text' );
function edit_genesis_search_text( $text ) {
    return esc_attr( 'Search...' );
}

//* Customize search form input button text
add_filter( 'genesis_search_button_text', 'edit_search_button_text' );
function edit_search_button_text( $text ) {

	return esc_attr( '&#xf21f;' );

}