[gnutls-devel] GnuTLS | gnutls_int.h: make DECR_LEN neutral to signedness (!1056)

[Development of GNU's TLS library]

Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/merge_requests/1056

Branches: tmp-decr-len to master
Author:    Daiki Ueno
Assignees: 


`DECR_LEN` was previously implemented in a way that it first decrements the given length and then checks whether the result is negative.  This requires the caller to properly coerce the length argument to a signed integer before invoking the macro.

This changes the logic to first compare the length and the amount to subtract, so the macro works both with signed and unsigned lengths.

## 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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