K 10
svn:author
V 3
gjb
K 8
svn:date
V 27
2015-02-10T12:04:38.458480Z
K 7
svn:log
V 473
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

END