I've copied alsa-driver-0.9.3a.ebuild to alsa-driver-0.9.3c.ebuild in portage overlay, computed digests and upgraded without problems. I won't post the ebuild as it is the same.
reassigning to wrangler at request of originator
couly any one explain me comment #1 ? (why ???)
This sounds like mambo-jumbo to mee, too. :) Anyhow, I had added 0.9.3c to portage earlier today, so this can be closed.