Fix coverity issues on branch 8.4 #404

Job	Run time
basic_gcc	18s
check-ansi	2m 1s
check_update	1m 0s
address_ub_sanitizer	11m 26s
basic_clang	12s
no-deprecated	15s
minimal	2m 25s
non-caching	4m 14s
no-shared (ubuntu-latest)	16s
enable_non-default_options	25s
fips_and_ktls	17s
no-shared (macos-latest)	2m 27s
legacy	3m 37s
memory_sanitizer	17m 38s
no-legacy	18s
ntls_address_ub_sanitizer	9m 42s
ntls_memory_sanitizer	15m 58s
symbol_prefix-test	1m 12s
threads_sanitizer	11s
buildtest	6m 52s
EC_POINTs_api_test	19m 0s
external-test-pyca (1.51.0, 3.9)	1m 25s
ntls-with-fips	23s
ntls	9s
ntls-without-sm234	15s
out-of-source-and-install (ubuntu-latest)	16s
out-of-source-and-install (macos-latest)	3m 14s
phe_test	10s
zkp-build-test	12s
	1h 45m 48s

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