ipv6 multicast refcnt panic

[Bruce M. Simpson]

Andrew Thompson wrote:
> I have come across this panic which appears to be from incorrect
> refcounting on the inet6 multicast code.
>   
I'm assuming this is in -CURRENT, as the refcount code has not yet been 
MFCed.

...

> in6m_refcount is still 1 so the in6_multi is not freed.

I'll try to investigate further as time permits. Thanks for pointing 
this out, I suspect the same problem affects vlan and other nested cloners.

Regards,
BMS