20240120-multi-test-fixes

[douzzer]

src/x509.c: fix true-positive nullPointerRedundantCheck in wolfSSL_X509V3_set_ctx(). also adds thorough WOLFSSL_MSG() coverage for failures.

tested with ../testing/git-hooks/wolfssl-multi-test.sh ... super-quick-check

reported by

[cppcheck-all] [8 of 216] [d043333bee]
    configure...   real 0m13.156s  user 0m6.488s  sys 0m8.065s
    cppcheck...41ea1109ec (<john.bland@wolfssl.com> 2024-01-17 18:46:24 -0500 13856)     ctx->x509 = wolfSSL_X509_new_ex(issuer->heap);
src/x509.c:13856:37: warning: Either the condition 'issuer' is redundant or there is possible null pointer dereference: issuer. [nullPointerRedundantCheck]
    ctx->x509 = wolfSSL_X509_new_ex(issuer->heap);
                                    ^
25aa0af260 (<sean@wolfssl.com> 2022-04-06 17:25:26 +1000 13861)     if (issuer)
src/x509.c:13861:9: note: Assuming that condition 'issuer' is not redundant
    if (issuer)
        ^
41ea1109ec (<john.bland@wolfssl.com> 2024-01-17 18:46:24 -0500 13856)     ctx->x509 = wolfSSL_X509_new_ex(issuer->heap);
src/x509.c:13856:37: note: Null pointer dereference
    ctx->x509 = wolfSSL_X509_new_ex(issuer->heap);
                                    ^
   real 1m5.107s  user 7m37.876s  sys 0m23.773s
    cppcheck-all fail_analysis
    failed config: '--enable-all' '--enable-testcert' '--enable-srtp'

(among other cppcheck scenarios in the nightly.)

[douzzer]

retest this please.

[jpbland1]

I see I should have checked if those params were non-null, looks good now