Ed Maste 1c91aedf25 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
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