res/res_pjsip/pjsip_options.c: Eliminate excessive RAII_VAR usage.

* Fix off nominal ref leak in find_or_create_contact_status().

* Add missing NULL check of status in update_contact_status() and
init_start_time().


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/12@422214 f38db490-d61c-443f-a65b-d21fe96a405b