Merge branch 'rs/mailinfo-qp-decode-fix' into maint

"git mailinfo" was loose in decoding quoted printable and produced
garbage when the two letters after the equal sign are not
hexadecimal.  This has been fixed.

* rs/mailinfo-qp-decode-fix:
mailinfo: don't decode invalid =XY quoted-printable sequences

diff --cc mailinfo.c
Simple merge