ext/pre_shared_key: avoid unnecessary use of VLA for MSVC
Suggested by Gisle Vanem in: https://github.com/gnutls/gnutls/commit/fd8c1ec8fe155861dffa28811127f101b6697b4b#r31802648
Checklist
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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:
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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
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This feature/change has adequate documentation added -
No obvious mistakes in the code
Edited by Nikos Mavrogiannopoulos