[gnutls-devel] GnuTLS | gnutls_session_get_data2: fix operation without a timeout callback (!1068)

[Development of GNU's TLS library]

Nikos Mavrogiannopoulos created a merge request: https://gitlab.com/gnutls/gnutls/merge_requests/1068

Project:Branches: nmav/gnutls:tmp-fix-session-get2 to gnutls/gnutls:master
Author:    Nikos Mavrogiannopoulos



When TLS1.3 was introduced, gnutls_session_get_data2 was modified to assume that the callbacks set included the timeout one which was not previously necessary except for some special cases. This corrects that issue and makes sure that gnutls_session_get_data2() does not fail (but not necessarily succeed), if that timeout callback is not set.


## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [x] Code modified for feature
 * [x] Test suite updated with functionality tests
 * [x] Documentation updated / NEWS entry present (for non-trivial changes)
 * [x] 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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