[FWP] correction on the ip address checker

[michael salmon <ms@speakeasy.org>]

i could've sworn i had that fixed, like i said my mail program ( kmail ) is
kinda glitchy. but the fix is simple and i think its what i benchmarked it with
also. 
instead of 'if($_<256)', 'if($_>0 & $_<256)' should do the trick...

sorry for so many posts in such a condensed time, it seems like the FWP
forwarder takes a very long time to parse out mail, nearly 30 mins..
michael salmon

 --  http://www.6x4.org
"The 3 great virtues of a programmer:
  Laziness,Impatience, and hubris.
	--Larry Wall

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