WordPress - Move the textarea to the top of the comment form

functions.php

function jk_move_textarea( $input = array () ) {
    static $textarea = '';

    if ( 'comment_form_defaults' === current_filter() ) {
        $textarea = $input['comment_field'];
        $input['comment_field'] = '';	
        return $input;
    }
    if ( is_singular( 'post' ) || is_page() ) {
        print $textarea;
    }
}

add_action( 'comment_form_defaults',	'jk_move_textarea' );
add_action( 'comment_form_top',		'jk_move_textarea' );