typo fix (\fB -> \fR) before "return negative on error"

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
add author's email

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Clean up .gitignore some.

Signed-off-by: Peter Jones <pjones@redhat.com>
Harden up guid.h some.

Laszlo Ersek rightly pointed out:
1) ZZZZZZZ == 0
2) strtol() should be strtoul()

Signed-off-by: Peter Jones <pjones@redhat.com>