emulators/virtualbox-ose-kmod: Fix kernel panic on 13-CURRENT with EPOCH and bridge mode.

[nc]

Summary

emulators/virtualbox-ose-kmod: Fix kernel panic on 13-CURRENT with EPOCH and bridge mode.

Submitted by: Neel Chauhan <neel AT neelc DOT org>

Test Plan

Use 13-CURRENT, compile virtualbox-ose-kmod with this patch, test bridge mode. It should work.

[kp]

It's not just required if you happen to be bridging. ether_demux() expects to be called in epoch context. (Its first call is to NET_EPOCH_ASSERT().)

[jkim]

LGTM

[nc]

Update PORTREVISION for current Ports tree.

[0mp]

You've got my approval to commit, @nc!