code: func ifaceDelVLAN(iface *net.Interface, vlan *seesaw.VLAN) error {
  	name := fmt.Sprintf("%s.%d", iface.Name, vlan.ID)
  	vlanIface, err := net.InterfaceByName(name)
  	if err != nil {
  		return fmt.Errorf("Failed to find VLAN interface %q: %v", name, err)
  	}
  	return ipRunIface(vlanIface, "link del dev %s", vlanIface.Name)
  }
docs: // ifaceDelVLAN removes a VLAN interface from the given physical interface.