[gnutls-devel] GnuTLS | Fix memory leak with client certificate auth (!1347)

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remiolivier created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1347

Project:Branches: remiolivier/gnutls:mem-leak-client-cert-auth-rehandshake-ocsp to gnutls/gnutls:master
Author:    remiolivier



Fix memory leak with client certificate authentication when rehandshake with ocsp.

On rehandshake a malloc is performed in status_request.c in _gnutls_recv_server_certificate_status:  
```cpp
info->raw_ocsp_list = gnutls_malloc(sizeof(gnutls_datum_t));
```

Whether or not it is already allocated.

A check should be performed first and free the previous allocated resources if any.

Addresses bug: gnutls/gnutls#1107

## Checklist
 * [X] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)
 * [ ] CI timeout is 2h or higher (see Settings/CICD/General pipelines/Timeout)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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