Fix tautological-compare warnings

Gary Lockyerrequested to merge
samba-team/devel/samba:gary-tautological-compare into master

The wrapping of pointer arithmetic is undefined behavior. Clang from version 20 onwards will treat an overflow check of the following form:

    ptr + offset < ptr

as always evaluating to false

Checklist

  • Commits have Signed-off-by: with name/author being identical to the commit author
  • (optional) This MR is just one part towards a larger feature.
  • (optional, if backport required) Bugzilla bug filed and BUG: tag added
  • Test suite updated with functionality tests
  • Test suite updated with negative tests
  • Documentation updated
  • CI timeout is 3h or higher (see Settings/CICD/General pipelines/ Timeout)

Reviewer's checklist:

  • There is a test suite reasonably covering new functionality or modifications
  • Function naming, parameters, return values, types, etc., are consistent and according to README.Coding.md
  • This feature/change has adequate documentation added
  • No obvious mistakes in the code

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