kern/172599: [ipfilter] [patch] Null function pointer in ipfilter

[eadler at FreeBSD.org]

Synopsis: [ipfilter] [patch] Null function pointer in ipfilter

Responsible-Changed-From-To: eadler->freebsd-bugs
Responsible-Changed-By: eadler
Responsible-Changed-When: Thu Jan 31 13:58:04 UTC 2013
Responsible-Changed-Why: 
sorry I held on to this for so long;   at the moment I have no time to
look at this PR so return to the pool

http://www.freebsd.org/cgi/query-pr.cgi?pr=172599