K 10
svn:author
V 3
mav
K 8
svn:date
V 27
2009-04-03T10:38:24.667800Z
K 7
svn:log
V 326
MFC rev. 188464.

Check for device_set_devclass() errors and skip driver probe/attach if any.
Attach called without devclass set crashes the system.

On attach/resume some ATA drivers sometimes trying to create duplicate adX
device. It is surely their own problem, but it is not a reason to crash here.

Approved by:	re (kib)

END