ifconfig list scan on NetBSD 4

[Stephen Borrill <netbsd%precedence.co.uk@localhost>]

I've had an initial naive attempt at backporting the ifconfig list scan 
functionality to NetBSD 4 based on this commit:
http://mail-index.netbsd.org/source-changes/2007/12/16/0010.html

It all compiles fine, but ifconfig ath0 list scan just returns immediately 
(no error). I've not looked any further into it yet, but I would like to 
know whether it should work with a bit of prodding or whether I'm wasting 
my time because of large changes elsewhere in net80211.

--
Stephen