iwlwifi: make IWLWIFI a tristate
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: NAdrian Bunk <bunk@kernel.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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