sysinstall and graid mirror on 9.1R

Hi,

I know sysinstall is deprecated and gone from -current, but there is 
still 8/9 that will be supported for few years so this may worth fixing. 
Got this anytime I starting sysinstall on a system, installed onto graid 
mirror:

http://people.freebsd.org/~rm/sysinstall_graid.png

No more have access to that system, so will not be able to test 
anything. But it's 100% reproducible in that configuration.

-- 
Regards,
Ruslan

Tinderboxing kills... the drives.