Fix coverity issues on branch 8.4 #395

Job	Run time
check_update	1m 3s
check-ansi	2m 13s
basic_clang	9s
basic_gcc	18s
minimal	2m 2s
no-deprecated	17s
address_ub_sanitizer	11m 11s
no-shared (ubuntu-latest)	17s
buildtest	6m 48s
no-shared (macos-latest)	2m 29s
enable_non-default_options	18s
fips_and_ktls	19s
legacy	3m 41s
memory_sanitizer	25m 3s
no-legacy	19s
non-caching	4m 22s
ntls_address_ub_sanitizer	9m 47s
ntls_memory_sanitizer	15m 53s
symbol_prefix-test	1m 8s
threads_sanitizer	10s
EC_POINTs_api_test	19m 5s
external-test-pyca (1.51.0, 3.9)	1m 26s
ntls-with-fips	17s
out-of-source-and-install (ubuntu-latest)	26s
out-of-source-and-install (macos-latest)	3m 23s
phe_test	13s
ntls	12s
ntls-without-sm234	16s
zkp-build-test	15s
	1h 53m 20s

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