small regression in cbb and a confusion with rl driver

[M. Warner Losh]

In message: <200311071650.20242.hadara at bsd.ee>
            Sven Petai <hadara at bsd.ee> writes:
: this bug is introduced by the version 1.86 of the file

I think I've committed a fix for this.  It disables the workaround for
some chipsets.  I'll reenable it when I can verify things better.

Warner