http_client.c: fix tracing error response message bodies #1467

Job	Run time
run-checker (no-cmp)	5m 5s
run-checker (no-cms)	5m 19s
run-checker (no-dgram)	4m 54s
run-checker (no-dh)	5m 16s
run-checker (no-dtls)	5m 24s
run-checker (no-ec)	4m 36s
run-checker (no-ecx)	5m 18s
run-checker (no-http)	5m 17s
run-checker (no-legacy)	5m 39s
run-checker (no-sock)	4m 50s
run-checker (enable-ssl-trace)	5m 24s
run-checker (no-stdio)	2m 26s
run-checker (no-threads)	5m 8s
run-checker (no-thread-pool)	5m 42s
run-checker (no-default-thread-pool)	5m 23s
run-checker (no-tls)	4m 48s
run-checker (no-tls1_2)	5m 31s
run-checker (no-tls1_3)	4m 52s
run-checker (enable-trace enable-fips)	5m 45s
run-checker (no-ui)	5m 23s
run-checker (no-quic)	5m 12s
	1h 47m 12s

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