[PATCH] nf_log: check function arguments

Hi Dave!

Please apply to your net-2.6.14, thanks

Ok, this will be my last patch for some time, I promise.  Guess you must
be bored by now...

-- 
- Harald Welte [off-list ref]                 http://netfilter.org/
============================================================================
  "Fragmentation is like classful addressing -- an interesting early
   architectural error that shows how much experimentation was going
   on while IP was being designed."                    -- Paul Vixie