[sr-dev] [kamailio/kamailio] registrar: clean avp/xavp created at 'usrloc:contact-expired' route_event (#1994)

[Victor Seva]

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#### Description
I was creating avp variables at route_event[usrloc:contact-expired] and shared memory was always growing I think this is the same issue #1391 and solved by ad46b115bedec01c52c5a9dcde0756db85ee61ec

You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/1994

-- Commit Summary --

  * registrar: clean avp/xavp created at 'usrloc:contact-expired' route_event

-- File Changes --

    M src/modules/registrar/regpv.c (3)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1994.patch
https://github.com/kamailio/kamailio/pull/1994.diff

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