a code reduction function addition to cam_xpt

[Scott Long]

mjacob at freebsd.org wrote:
> 
>> Erm, we make large use of variadic macros into the code :)
> 
> Yes. I think that if the code is never going to get backported to FBSD5 
> or earlier, it's probably fair enough to use, but for the aesthetics.

You mean FreeBSD 4 or FreeBSD 5?  CAM is about to be pretty unportable 
back to FreeBSD 4 for other reasons.

Scott