Also remove stat() call and just rely on errno from open() call to discern
whether dev node exists or not.
Sponsored by: Intel
Reviewed by: kib, carl
MFC after: 3 days
and firmware revision in the controller's identify structure.
Also modify consumers of these fields to ensure they only use the
specified number of bytes for their respective fields.
Sponsored by: Intel
Reviewed by: carl
MFC after: 3 days
* Use 0/1 instead of sysexits. Man pages are confusing on this topic,
but 0/1 is sufficient for nvmecontrol.
* Use err function family where possible instead of fprintf/exit.
* Fix some typing errors.
* Clean up some error message inconsistencies.
Sponsored by: Intel
Submitted by: bde (parts of firmware.c changes)
MFC after: 3 days
