util/nvmutil: use EXIT_FAILURE/SUCCESS for exits

this, in conjunction with the centralised exit scheme now
used by nvmutil, means that we have portable exit status.

notwithstanding the use of non-portable unix functions, and
especially the use of non-standard err.c (which GNU and BSD
libc implementations all have anyway, as does musl).

this code should now run on essentially any computer with
Linux or BSD on it.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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