func (n *upnp) DeleteMapping(protocol string, extPort, intPort int) error {
	return n.client.DeletePortMapping(
		"", uint16(extPort), strings.ToUpper(protocol))
}
func (n *upnp) DeleteMapping(protocol string, extPort, intPort int) error {
	return n.client.DeletePortMapping(
		"", uint16(extPort), strings.ToUpper(protocol))
}
func ( n * upnp ) DeleteMapping ( protocol string , extPort , intPort int ) error { return n . client . DeletePortMapping ( " " , uint16 ( extPort ) , strings . ToUpper ( protocol ) ) }
// DeleteMapping removes the port mapping to UPnP interface.
DeleteMapping removes the port mapping to UPnP interface .