Use 't' (bit-field) not 'b' (bit-sized integral type) for describing MRIE (aka

Use 't' (bit-field) not 'b' (bit-sized integral type) for describing MRIE (aka
"Method of Reporting Informational Exceptions") in the SCSI mode database.
T10/04-371 revision 2 (revision 4; page 2, table 1) describes it as a
bit-field of 4 bits wide.

1. http://www.t10.org/ftp/t10/document.04/04-371r2.pdf

This a recommit of head@r289913 to fix the original commit message, in
particular:
- I incorrectly claimed that unit change was 'i' -> 't'.
- The spec I reference in this commit is 2 decades newer than the one noted in
  r289913. The fields in the SCSI mode database are more complete in the newer
  spec, so it'll be easier for someone to decipher this commit if need be
  later.
- I screwed up the bug entry in the previous commit message

Pointyhat to: ngie (for botching up r289913)
PR: 200619
Reported by: Michael Baptist
Submitted by: Lars Skodje
Sponsored by: EMC / Isilon Storage Divisionf