Freeze exception for atl2 2.0.5

[Ben Armstrong <synrg@sanctuary.nslug.ns.ca>]

The 2.0.3-3 release of atl2 currently in Lenny is essentially
2.0.4 (same fix with inconsequential difference in implementation).
2.0.5 adds another one-line fix from Atheros to prevent spurious device
resets under heavy load.  It "just fixes a comparison to check the
right thing, rather than a thing that would be the right thing only
after it gets updated, but hasn't yet", according to Chris Snook, the
upstream maintainer.

I'm hoping we can get this in soon and then have the new atl2 included
in l-m-e as well.

Ben