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git2svn
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2022-02-05T16:28:26.706947Z
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dma: exit if invoked with invalid (zero) argc

This was prompted by the recent pkexec vulnerability (CVE-2021-4034).
This change is being made on general principle for setuid/setgid
binaries and is not in response to an actual issue.

Reviewed by:	kevans, markj (both earlier)
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D34087

(cherry picked from commit 1c91aedf25bce879a8aced6439200e46601eb8a4)

Git Hash:   647d3bf17cd907ded624dccf4fe4567924c4f399
Git Author: emaste@FreeBSD.org
END