When an incoming packet is reflected back as an ICMP reply, make sure we zero "m->m_pkthdr.rcvif", otherwise ipfw may wrongly match the outgoing packet. PR:		kern/9723 Submitted by:	David Malone <dwmalone@maths.tcd.ie>
When an incoming packet is reflected back as an ICMP reply, make sure we
zero "m->m_pkthdr.rcvif", otherwise ipfw may wrongly match the outgoing packet.
PR:		kern/9723
Submitted by:	David Malone <dwmalone@maths.tcd.ie>

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