xfs_scrub: synchronize error levels & logging

xfs_scrub: synchronize error levels & logging

Having only a subset of the five error_levels present in
the log_level[] array is asking for trouble when someone
tries to __str_log(S_PREEN ...) and overruns the array.

Tie it all together in a single structure that's
initialized together to make the mapping more obvious and
idiot-proof.

Fixes-coverity-id: 1433618
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>