Remove atdevbase?

I'd like to remove the atdevbase variable and use KERNBASE directly in the few 
places it is still used if that is ok.  Patch is at 
http://www.FreeBSD.org/~jhb/patches/kill_atdevbase.patch

-- 
John Baldwin <jhb_at_FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org