expound customize

<?php
/*
Plugin Name: Expound Remove Related Posts
Plugin URI: n/a
Description: removes the 'related posts' section from single posts without the need of a child theme
Version: 1.0
Author: alchymyth
Author URI: http://transformationpowertools.com
License: GPL2
*/

add_action( 'setup_theme', 'modify_pluggable_expound_theme_functions' );

function modify_pluggable_expound_theme_functions() {

    if( wp_get_theme() == 'Expound' && get_stylesheet_directory() == get_template_directory() ) :
        //check for the right theme and that no child theme is used
        function expound_get_related_posts() {
            $args = array(
            'ignore_sticky_posts' => true,
            'category_name' => 'expound-removed-related-posts'
            //impossible category name to generate an empty query
            );
        return new WP_Query( $args ); //return no related posts
        }
    endif;
}
?>