Fix coverity issues on branch 8.4 #403

Job	Run time
address_ub_sanitizer	11m 0s
basic_clang	10s
basic_gcc	17s
buildtest	6m 48s
check_update	58s
check-ansi	2m 3s
enable_non-default_options	17s
fips_and_ktls	17s
legacy	3m 45s
memory_sanitizer	25m 54s
minimal	2m 7s
no-deprecated	18s
no-legacy	16s
non-caching	4m 21s
no-shared (ubuntu-latest)	22s
ntls_address_ub_sanitizer	9m 54s
ntls_memory_sanitizer	14m 39s
no-shared (macos-latest)	2m 22s
symbol_prefix-test	1m 9s
threads_sanitizer	10s
EC_POINTs_api_test	19m 40s
external-test-pyca (1.51.0, 3.9)	1m 21s
ntls	12s
ntls-with-fips	18s
ntls-without-sm234	18s
out-of-source-and-install (ubuntu-latest)	25s
phe_test	10s
out-of-source-and-install (macos-latest)	3m 18s
zkp-build-test	12s
	1h 53m 1s

Provide feedback