Invoke tear_down when exiting test_encode_tls_sct() prematurely #353

Job	Run time
address_ub_sanitizer	10m 44s
basic_clang	4m 39s
basic_gcc	4m 19s
buildtest	6m 8s
check_docs	1m 18s
check_update	2m 10s
check-ansi	2m 19s
enable_non-default_options	3m 44s
external-test-pyca (1.51.0, 3.9)	7m 6s
external-tests	7m 34s
legacy	4m 19s
memory_sanitizer	21m 10s
fips_and_ktls	4m 30s
minimal	2m 12s
no-deprecated	4m 7s
no-legacy	4m 53s
non-caching	6m 8s
no-shared-macos (macos-13)	5m 33s
no-shared-ubuntu	4m 4s
no-shared-macos (macos-14)	2m 52s
out-of-readonly-source-and-install-macos (macos-13)	8m 1s
out-of-readonly-source-and-install-ubuntu	6m 14s
out-of-readonly-source-and-install-macos (macos-14)	4m 20s
self-hosted	0s
threads_sanitizer	3m 54s
	2h 12m 18s

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