Fixed possible error in determining ATA version if no minor_version field in DEVICE ID.

Detect -EIO if sending a captive self-test command and do not generate error message.


git-svn-id: https://smartmontools.svn.sourceforge.net/svnroot/smartmontools/trunk@72 4ea69e1a-61f1-4043-bf83-b5c94c648137