ip_mroute: fix the viftable export sysctl
It seems that in r354857 I got more than one thing wrong.
Convert the SYSCTL_OPAQUE to a SYSCTL_PROC to properly export the these
days allocated and not longer static per-vnet viftable array.
This fixes a problem with netstat -g which would show bogus information
for the IPv4 Virtual Interface Table.
PR: 246626
Reported by: Ozkan KIRIK (ozkan.kirik gmail.com)
MFC after: 3 days
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head/sys/netinet/ip_mroute.c