[gnutls-devel] GnuTLS | gnutls_aead_cipher_init: fix potential memleak (!1274)

[Development of GNU's TLS library]

Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1274

Branches: tmp-aead-init-leak to master
Author:    Daiki Ueno



When _gnutls_aead_cipher_init() fails, the function returns without
freeing the allocted handle.  This was once fixed in commit
502be130493e8ce802cdf60fffdbb5f1885352a5 but regressed after a code
reorganization in commit 2eef509ce5f2d250f8dcaeffa46444dd2b694e91.

Reported by Miroslav Lichvar.

Fixes #1010.

## 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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