Minor fixes for nightly multi-test tool

[JacobBarthelmeh]

Most fixes are from the nightly multi-test tool. The mp_clear on error with integer.c is from a fuzzing report.

[Copilot]

Pull request overview

This PR applies small robustness fixes from nightly multi-test runs and a fuzzing report, focusing on safer cleanup/error-handling and preventing NULL dereferences.

Changes:

• Prevent potential leaks by clearing temporary bignum state on early error return in mp_div_3.
• Avoid NULL dereferences by using a safe heap pointer in ASN decode functions and guarding SNI parsing against sni == NULL.
• Improve test helper robustness by checking fwrite() success before returning.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
wolfcrypt/src/integer.c	Clears temporary mp_int before returning on invalid input to avoid leaks.
wolfcrypt/src/asn.c	Uses a local heap variable to safely allocate/free ASN template data even when key is NULL.
tests/api.c	Adds fwrite() error handling when persisting LMS private key material in a test helper.
src/tls.c	Adds NULL checks around sni and host_name accesses in SNI parsing logic.
configure.ac	Auto-disables OCSP responder when SHA-1 is disabled under enable-all modes; errors otherwise.

Comments suppressed due to low confidence (1)

tests/api.c:1

• fwrite() returns size_t, while privSz is a word32. Comparing different-width unsigned types can trigger compiler warnings and, on some platforms, subtle issues. Consider casting privSz to size_t for the comparison (and/or storing the expected size in a size_t) so the check is type-consistent.

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[JacobBarthelmeh]

Retest this please Jenkins PRB-FIPS-windows-test-ACVP