Fix coverity issues on branch 8.4 #843

Job	Run time
run-checker (no-cmp)	2m 4s
run-checker (no-cms)	2m 12s
run-checker (no-ct)	2m 7s
run-checker (no-dtls)	2m 10s
run-checker (no-ec)	1m 57s
run-checker (no-ec2m)	2m 8s
run-checker (no-legacy)	2m 11s
run-checker (no-sock)	2m 19s
run-checker (no-srp)	2m 6s
run-checker (no-srtp)	2m 10s
run-checker (enable-ssl-trace)	2m 12s
run-checker (no-tests)	1m 46s
run-checker (no-threads)	2m 6s
run-checker (no-tls)	2m 8s
run-checker (no-tls1_2)	2m 12s
run-checker (no-tls1_3)	2m 6s
run-checker (enable-trace enable-fips)	2m 24s
run-checker (no-ts)	2m 19s
run-checker (no-ui)	2m 13s
	40m 50s

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