notifiee.go
func (nb *NotifyBundle) ListenClose(n Network, a ma.Multiaddr) {
	if nb.ListenCloseF != nil {
		nb.ListenCloseF(n, a)
	}
}
func (nb *NotifyBundle) ListenClose(n Network, a ma.Multiaddr) {
	if nb.ListenCloseF != nil {
		nb.ListenCloseF(n, a)
	}
}
// ListenClose calls ListenCloseF if it is not null.