New suid-root helper for pam_unix auth -- how to review?

So, I added some code to allow pam_unix authentication for
non-privileged processes by using a suid-root helper internally, and
uploaded my code to phabricator: https://reviews.freebsd.org/D34322

That's the top of a 3-commits-stack, with the first commit only fixing
some tiny error I came across, the second adds the helper and the last
modifies pam_unix to use the new helper.

My question now is, how should I proceed to get a review? In
MAINTAINERS, I read des@ is maintaining libpam -- does this apply to
modules as well, so should I add him as a reviewer? There's also the
wording "email only" and I'm not sure what that means -- should I send
him the patches by mail instead of adding him on phabricator?

Thanks, Felix

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