[sr-dev] [kamailio/kamailio] jsonrpcs: fix double free crash (#1839)

[Federico Cabiddu]

#### Pre-Submission Checklist
- [X] Commit message has the format required by CONTRIBUTING guide
- [X] Commits are split per component (core, individual modules, libs, utils, ...)
- [X] Each component has a single commit (if not, squash them into one commit)
- [X] No commits to README files for modules (changes must be done to docbook files
in `doc/` subfolder, the README file is autogenerated)

#### Type Of Change
- [X] Small bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds new functionality)
- [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist:
- [X] PR should be backported to stable branches
- [X] Tested changes locally
- [ ] Related to issue #XXXX (replace XXXX with an open issue number)

#### Description
srjson_DeleteDoc(ctx->jreq) is already called in jsonrpc_clean_context(ctx). Calling it twice causes a crash due to a double free attempt.
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/1839

-- Commit Summary --

  * jsonrpcs: fix double free crash

-- File Changes --

    M src/modules/jsonrpcs/jsonrpcs_mod.c (1)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1839.patch
https://github.com/kamailio/kamailio/pull/1839.diff

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