jail: fix backfilling the "name" for jid-named jailsHEADmain

Using the cfparam variant of add_param() will actually copy the name and
flags from the passed-in param, which I hadn't considered.  We actually
want the name/flags from the "name" param so that we can do variable
expansion against it right after that -- otherwise it cannot be found,
since variable expansion actually searches by name.

While we're here, `jls -e` was the intermediate name for `jls -c` that
never saw the light of the day.  Fix our existence test.

Reviewed by:	jamie
Fixes:	02944d8c49 ("jail: consistently populate the KP_JID [...]")
Differential Revision:	https://reviews.freebsd.org/D51831

0 files changed, 0 insertions, 0 deletions