Invoke tear_down when exiting test_encode_tls_sct() prematurely #308

Job	Run time
cygwin (windows-2019, win64, -DCMAKE_C_COMPILER=gcc --strict-warnings no-fips)	31m 36s
minimal (windows-2019)	8m 12s
minimal (windows-2022)	9m 48s
plain (windows-2019)	16m 40s
plain (windows-2022)	16m 4s
shared (windows-2019, win64, enable-fips)	27m 26s
shared (windows-2019, win32, --strict-warnings no-fips)	31m 12s
shared (windows-2022, win64, enable-fips)	27m 13s
shared (windows-2022, win32, --strict-warnings no-fips)	30m 58s
	3h 19m 9s

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