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ipfw(4): make O_IPVER/ipversion match IPv4 or 6, not just IPv4.

Description

ipfw(4): make O_IPVER/ipversion match IPv4 or 6, not just IPv4.

Submitted by: Neel Chauhan <neel AT neelc DOT org>
Reviewed by: Lutz Donnerhacke
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D25227