20251002-misc-clang-tidy-and-fips-fixes

[douzzer]

tests/api/test_dtls.c: add missing ExpectIntEQ() around wolfSSL_connect() in test_dtls_bogus_finished_epoch_zero();

wolfcrypt/test/test.c: fix gate for wc_DhGeneratePublic() test in dh_ffdhe_test() to properly exclude 5.3.0.

fixes bugprone-unused-return-value and error: implicit declaration of function ‘wc_DhGeneratePublic’.

tested with

wolfssl-multi-test.sh ...
clang-tidy-all-sp-all
fips-140-3-v5-ready-optest-acvp-intelasm
fips-140-3-dev-kcapi

and with super-quick-check.

[douzzer]

retest this please
(Bozeman network glitches)