jaildesc: fix typo and style(9) violations.

Reported by: kib
MFC after: 3 days

jaildesc: replace EBADF with EINVAL

Following fd9e09cb, EBADF is not the suitable error code for a non-
jail descriptor passed to jail_set, jail_get, jail_attach_fd, and
jail_remove_fd.

Reported by

jaildesc: replace EBADF with EINVAL

Following fd9e09cb, EBADF is not the suitable error code for a non-
jail descriptor passed to jail_set, jail_get, jail_attach_fd, and
jail_remove_fd.

Reported by: kib

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jaildesc: fix a misplaced error check and a spurious finit call
Reported by: kib

jail: add jail descriptors

Similar to process descriptors, jail desriptors are allow jail
administration using the file descriptor interface instead of JIDs.
They come from and can be used by jail_s

jail: add jail descriptors

Similar to process descriptors, jail desriptors are allow jail
administration using the file descriptor interface instead of JIDs.
They come from and can be used by jail_set(2) and jail_get(2),
and there are two new system calls, jail_attach_jd(2) and
jail_remove_jd(2).

Reviewed by: bz, brooks
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D43696

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