s3:smbd: Fix size_t underflow
This commit was originally part of !3703 (closed) (see the discussion there), creating a separate MR for it.
Checklist
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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:
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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
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This feature/change has adequate documentation added -
No obvious mistakes in the code