emaste 67f9ad3b97 rc.d/jail: avoid misinterpreting expr arguments
(Due to some misconfiguration) I ended up with _mask set to
"-v<something>", and /etc/rc.d/jail then failed with
"expr: illegal option -- v".

Use "expr --" so that variable content is never interpreted as an
option.

Reviewed by:	jamie
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D14535
2018-02-28 17:20:10 +00:00
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