Exit after printing a message on stderr when we can't get a
message. This is slightly different than linux, but keeps shell
scripts from thinking the value of the variable is the error message
and so is a net win.
Sponsored by: Netflix
with no creative content. Include "lost" changes from git:
o Use /dev/efi instead of /dev/efidev
o Remove redundant NULL checks.
Submitted by: kib@, dim@, zbb@, emaste@
line interface to the Linux program, as well as adding a number of
useful features to make using it in shell scripts easier (since we
don't have a filesystem to fall back on interacting with).
Differential Revision: https://reviews.freebsd.org/D8128
Reviewed by: kib@, wblock@, Ganael Laplanche
