panics on 6.3-RELEASE in IP stack

[Petr Holub]

> Yes, there's an off-by-one reference count bug in the multicast stuff.
You
> need 1.85.2.10 of sys/netinet/in.c:

I can confirm that RAT can be restarted many times now with this
patch applied (at least when RAT doesn't touch audio devices as
I may be also reporting some sound related panic soon ;-) ).
I'd also propose to release errata on this.

Thanks
Petr