From: Prarit Bhargava <prarit@sgi.com>

Suppress output of "Wait for ready failed before probe !" messages for 
non-existant interfaces.

Please see 
http://marc.theaimsgroup.com/?l=linux-ide&m=110553792013649&w=2 for 
further context on this patch.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>