CFT: ndis, iwi, ipw users

http://people.freebsd.org/~sam/curchan.patch

has changes to resolve an issue with not recognizing when an ap moves to 
a different channel.  It eliminates the use of ic->ic_bss->ni_chan to 
identify the current channel while scanning.  It's been reviewed and 
tested ok on ath, wi, ral, and ural devices.  I need folks to verify it 
does not break ndis, iwi, and ipw devices (there are changes for awi but 
so far as I know noone uses awi).

I want to get this committed to HEAD soon so quick feedback on those 
devices would be appreciated.  Thanks.

	Sam