From: Adrian Bunk <bunk@kernel.org>
Date: Mon, 5 May 2008 21:25:16 +0300

IWLWIFI should be a tristate so that if IWLCORE and/or IWL3945 are m
and none of them is y kbuild doesn't create an empty 
drivers/net/wireless/built-in.o

This patch also removes the pointless "default n".

Signed-off-by: Adrian Bunk <bunk@kernel.org>

I'll let this sit and cook for a while so that others can
review and test this patch.  We've had enough churn in this
area already :-)