Fix coverity issues on branch 8.4 #405

Job	Run time
address_ub_sanitizer	11m 2s
basic_clang	12s
basic_gcc	18s
check_update	1m 2s
check-ansi	1m 59s
minimal	2m 0s
no-deprecated	17s
non-caching	4m 18s
no-shared (ubuntu-latest)	16s
no-shared (macos-latest)	2m 23s
buildtest	6m 52s
enable_non-default_options	16s
fips_and_ktls	18s
legacy	3m 37s
no-legacy	17s
memory_sanitizer	17m 32s
ntls_address_ub_sanitizer	9m 36s
ntls_memory_sanitizer	17m 31s
threads_sanitizer	11s
symbol_prefix-test	1m 9s
EC_POINTs_api_test	19m 21s
external-test-pyca (1.51.0, 3.9)	1m 25s
ntls	10s
ntls-with-fips	18s
ntls-without-sm234	16s
out-of-source-and-install (ubuntu-latest)	16s
phe_test	17s
out-of-source-and-install (macos-latest)	3m 16s
zkp-build-test	15s
	1h 46m 40s

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