K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2019-06-02T14:03:56.886667Z
K 7
svn:log
V 440
jail_getid(3): add special-case immediate return for jid 0

As depicted in the comment: jid 0 always exists, but the lookup will fail as
it does not appear in the kernel's alljails list being a special jail. Some
callers will expect/rely on this, and we have no reason to lie because it
does always exist.

Reported by:	Stefan Hegnauer <stefan.hegnauer gmx ch>
MFC after:	soon (regression, breaks inspecting jail host bits, partial
revert)

END