ebec61f967
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)