add_filter( 'wcfm_login_redirect', function( $redirect_to, $user ) {
    if ( isset($user->roles) && is_array($user->roles) ) {
        if ( in_array( 'wcfm_vendor', $user->roles ) ) {
            $redirect_to = home_url();
        }
    }
    return $redirect_to;
}, 10, 2 );