jail: return a new descriptor from jail_get(JAIL_USE_DESC | JAIL_GET_DESC)HEADmain

Prior to this change, `jail_get` when called with `JAIL_USE|JAIL_GET_DESC`
would fail to return a valid descriptor in the positive case because the
`JAIL_USE_DESC` block jumped to `found_prison` before the descriptor was
allocated. This resulted in the returned jail descriptor always being -1,
despite the call being successful.

This change fixes the logic so `jfd_out` is properly initialized in the
aforementioned scenario.

MFC after: 3 days

Reviewed by:	jamie, ngie, adrian
Differential Revision:	https://reviews.freebsd.org/D60984

0 files changed, 0 insertions, 0 deletions