Glen Barber e90de53410 In scripts/mk-vmimage.sh, prevent incorrect usage() by
defaulting VMCONFIG to /dev/null, and additionally
ensuring VMCONFIG is not a character device before it
is sourced.

While here, be sure to exit if usage() is called.

This should effectively be no-op, but the usage() output
was discovered while investigating a larger issue.

MFC after:	1 week
X-MFC-with:	r277458, r277536, r277606, r277609,
		r277836, r278118, r278119, r278206
Sponsored by:	The FreeBSD Foundation
2015-02-10 12:04:38 +00:00
..
2014-12-24 18:51:25 +00:00
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2015-01-24 08:48:05 +00:00
2015-02-09 10:46:39 +00:00
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