pfsync: Handle syncdev going away

[kp]

Summary

If the syncdev is removed we no longer need to clean up the multicast
entry we've got set up for that device.

Pass the ifnet detach event through pf to pfsync, and remove our
multicast handle, and mark us as no longer having a syncdev.

Note that this callback is always installed, even if the pfsync
interface is disabled (and thus it's not a per-vnet callback pointer).

[bz]

That was kind-of the model I had in mind for the other callbacks as well ;-)

sys/netpfil/pf/if_pfsync.c

2309 ↗

(On Diff #48975)

The comment should end on the next line.

[kp]

Fix comment style