Fix coverity issues on branch 8.4 #402

Job	Run time
basic_clang	10s
basic_gcc	17s
check_update	1m 1s
check-ansi	2m 2s
address_ub_sanitizer	10m 54s
memory_sanitizer	18m 21s
minimal	2m 13s
no-deprecated	16s
non-caching	4m 27s
no-shared (ubuntu-latest)	22s
ntls_address_ub_sanitizer	9m 37s
no-shared (macos-latest)	2m 26s
ntls_memory_sanitizer	14m 50s
threads_sanitizer	11s
buildtest	6m 42s
EC_POINTs_api_test	19m 3s
enable_non-default_options	16s
external-test-pyca (1.51.0, 3.9)	1m 24s
fips_and_ktls	16s
no-legacy	18s
out-of-source-and-install (ubuntu-latest)	17s
legacy	3m 36s
out-of-source-and-install (macos-latest)	3m 13s
phe_test	9s
symbol_prefix-test	1m 11s
ntls	12s
ntls-with-fips	19s
ntls-without-sm234	23s
zkp-build-test	10s
	1h 44m 36s

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