Poplulate make from parent term of model

make_model.php

<?php

function update_custom_terms($post_id) {

    /**
     * Define taxonomies
     */
    $make = 'make';
    $model = 'model';

    // only update terms if it's a vehicle-listings post
    if ( 'vehicle-listings' != get_post_type($post_id)) {
        return;
    }

    // don't create or update terms for system generated posts
    if (get_post_status($post_id) == 'auto-draft') {
        return;
    }
   

    /*
    * Grab the parent term and populate the term
    */
    $terms = wp_get_post_terms($post_id, $model);
     foreach ($terms as $term) {
        if ($term->parent == 0) //check for parent terms only
        wp_update_term($term->term_id, $make, array(
            'name' => $term->name,
            'slug' => $term->slug
            )
        );
        return;
     }

}

//run the update function whenever a post is created or edited
add_action('save_post', 'update_custom_terms');