WP Change User Role on Gravity Form Complete

//add_action('gform_post_submission_7', 'my_update_user_role');
add_action('gform_after_submission_7', 'my_update_user_role', 10, 2);
function my_update_user_role($entry) {

    //$user_id = get_current_user_id();
    //$user_id = (int) $_GET['user'];
    //$user_id = wp_get_current_user();
    // trying this as suggested by Chris Hajer
    global $current_user;
    get_currentuserinfo();
    $user_id = $current_user->ID;

    echo $user_id;
    if(!$user_id)
        return;

    $user = new WP_User($user_id);
    //$user->set_role('editor'); // update "editor" to the name of the role you'd like to update the user too
    $user->remove_role( 'subscriber' );

}