12.2 Splay Tree ipfw potential panic source

This is the only change I'm aware of in the build I just put on a 
firewall that uses ipfw heavily, and it is not panic'ing quite regularly.

Same build, stable/12-n233371-c3e6df3967f, works fine without ipfw in 
active use on a different machine.

I'll see if I can get a dump from it but that may be difficult as the 
machine in question is a "small box" without attached storage (boots 
from an SD card.)

Just wanted to put a heads-up out there as this was just MFCd according 
to what saw on the lists a couple of days ago...

-- 
Karl Denninger
karl@denninger.net <mailto:karl@denninger.net>
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