[sr-dev] [kamailio/kamailio] nats: make sure pkg & shm memory is allocated; check pointers before freeing memory (#2792)

[Emmanuel Schmidbauer]

…freeing memory

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#### Description
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as per @miconda's suggestion, added memory checks

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

  https://github.com/kamailio/kamailio/pull/2792

-- Commit Summary --

  * nats: make sure pkg & shm memory is allocated; check pointers before freeing memory

-- File Changes --

    M src/modules/nats/nats_mod.c (69)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2792.patch
https://github.com/kamailio/kamailio/pull/2792.diff

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