Better handling of TEST UNIT READY command

[Grzegorz Bernacki]

Hi Scott,
> Sorry I missed the original posting on the scsi list.  I'm curious what
> ASC/ASCQ codes are being returned by the device.  This patch is good
> enough for now, please go ahead and commit it, but I'd like to see what
> the actual errors are so we can see if there's a more elegant way to
> handle it.

Those are values returned in sense data:
Error Code  0x70
Sense Key   0x06
ASC         0x28 
ASCQ        0x00

pozdrawiam,
Grzesiek