GnuTLS | rnd: use matching allocator for gnutls_free (!2058)

Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/2058

Project:Branches: dueno/gnutls:wip/dueno/gcc-analyzer-fixes to gnutls/gnutls:master
Author:   Daiki Ueno



<!-- Add a description of the new feature/bug fix. Reference any relevant bugs. -->

* ocsp: suppress false-positive reported by GCC 15 analyzer

GCC 15 analyzer reports:
```
  ocsp.c:2470:17: warning: dereference of NULL '*ocsps' [CWE-476] [-Wanalyzer-null-dereference]
   2470 |                 gnutls_ocsp_resp_deinit((*ocsps)[i]);
        |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```
`*ocsps` should always be non-NULL when this part is exercised. This
adds an assertion for that.

* dane: use matching deallocator for gnutls_malloc

Spotted by GCC analyzer:
```
  dane.c:972:17: warning: memory allocated with 'gnutls_malloc' should be deallocated with 'free' but was deallocated with 'free'
    972 |                 free(new_cert_list);
        |                 ^~~~~~~~~~~~~~~~~~~
```

* rnd: use matching allocator for gnutls_free

## 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)

## 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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