Add login/logout to primary and footer menu

I found a code somewhere that help me to add a login/logout menu option to my primary menu. Here is the code that is working

add_filter('wp_nav_menu_items', 'add_login_logout_link', 10, 2);

function add_login_logout_link($items, $args) { 

	if ( $args->theme_location == 'primary-menu' ) {	

        ob_start();

        wp_loginout('index.php');

        $loginoutlink = ob_get_contents();

        ob_end_clean(); 

        $items .= '<li>'. $loginoutlink .'</li>';
    }

    return $items;

}

I would like to add this to my footer menu as well. My footer is called ‘footer-menu’. I tried adding it as:
if ( $args->theme_location == ‘primary-menu’, ‘footer-menu’ )
but that broke the site.
Does anyone have advice on the right way to add this to my footer also?