trasz b2747e472e Fix use-after-free in kern_jail_set() triggered e.g. by attempts
to clear "persist" flag from empty persistent jail, like this:

jail -c persist=1
jail -n 1 -m persist=0

Submitted by:	Mateusz Guzik <mjguzik at gmail dot com>
MFC after:	2 weeks
2012-05-22 19:43:20 +00:00
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