kubevirt: DHCP server6 painc error

What happened: A clear and concise description of what the bug is. virt-launcher panic

What you expected to happen: A clear and concise description of what you expected to happen.

After I created the virtual machine, restarted the vm, looked at the log of virt-lanuncher, and found the phenomenon of panic

How to reproduce it (as minimally and precisely as possible): Steps to reproduce the behavior. Occasionally

Additional context: Add any other context about the problem here. pkg/network/dhcp/serverv6/serverv6.go

func (h *DHCPv6Handler) ServeDHCPv6(conn net.PacketConn, peer net.Addr, m dhcpv6.DHCPv6) {
	log.Log.V(4).Info("DHCPv6 serving a new request")

	// TODO if we extend the server to support bridge binding, we need to filter out non-vm requests

	response, err := h.buildResponse(m)
	if err != nil {
		log.Log.V(4).Reason(err).Error("DHCPv6 failed building a response to the client")

	}

	if _, err := conn.WriteTo(response.ToBytes(), peer); err != nil {
		log.Log.V(4).Reason(err).Error("DHCPv6 failed sending a response to the client")
	}
}

if response, err := h.buildResponse(m),has error will panic in this place：conn.WriteTo(response.ToBytes(), peer);

Environment:

• KubeVirt version (use virtctl version): 0.46
• Kubernetes version (use kubectl version): 1.23
• VM or VMI specifications: N/A
• Cloud provider or hardware configuration: N/A
• OS (e.g. from /etc/os-release): Centos7.6
• Kernel (e.g. uname -a): N/A
• Install tools: N/A
• Others: N/A