When copying a NAT rule struct to userland for save by ipfs, use the
length of the struct in memmove() rather than an unintialized variable.
This fixes the first of two kernel page faults when ipfs is invoked.
PR: 235110
Reported by: David.Boyd49@twc.com
MFC after: 2 weeks
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head/sys/contrib/ipfilter/netinet/ip_nat.c