- Correctly freeng pkg memory in core callbacks when body modifications take place with X-Siptrace headers, also fix potential pkg_free with not dynamicaly allocated objects.

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#### Description <!-- Describe your changes in detail -->

Releated to [57b1d5375927b987b162fcf0e2c99a39b717bd65](https://github.com/kamailio/kamailio/commit/57b1d5375927b987b162fcf0e2c99a39...) You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/3059

-- Commit Summary --

* siptrace: fix pkg memory leak when module configured with core callbacks

-- File Changes --

M src/modules/siptrace/siptrace.c (38) M src/modules/siptrace/siptrace_data.h (2) M src/modules/siptrace/siptrace_send.c (8)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/3059.patch https://github.com/kamailio/kamailio/pull/3059.diff