[PATCH] spectrum_cs: Fix firmware uploading errors

spectrum_cs: Fix the logic so we error when the device is *not* present!

This fixes firmware upload failures which prevent the driver from
working (the bug is also present in 2.6.17).

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Jeff Garzik <jeff@garzik.org>