Bug#166353: cdrom-detect: Tries to load the same module twice

[Petter Reinholdtsen <pere@hungry.com>]

Package: cdrom-detect
Version: 0.02

I tested d-i on a Dell 2650, and on this machine, cdrom-detect
mistakingly belives that the aic7xxx module is the correct driver for
the SCSI card (the correct driver is aacraid).  It also mistakingly
belives there are two SCSI controller cards supported by aic7xxx, and
because of this tries to find the aic7xxx module twice.  I suggest the
list of modules is passed through 'sort -u' to make sure each module
is loaded only once.