[gnutls-devel] GnuTLS | ktls: fix ChaCha20-Poly1305 IV passing for TLS 1.2 (!2079)

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Alexander Sosedkin created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/2079

Project:Branches: asosedkin/gnutls:ktls-chacha-iv-fix to gnutls/gnutls:master
Author:   Alexander Sosedkin

Reviewer: František Krenželok

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

For TLS 1.2 + Chacha20 + KTLS, IV was effectively sequence number + a bit of stack garbage.
The test forks client and server, so the likelihood of said garbage matching was high, masking the issue.

* ktls: fix ChaCha20-Poly1305 IV passing for TLS 1.2 - the fix
* ktls: simplify ChaCha20‑Poly1305 IV passing for TLS 1.2 - should be a no-op

## 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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