Invoke tear_down when exiting test_encode_tls_sct() prematurely #306

Job	Run time
cygwin (windows-2019, win64, -DCMAKE_C_COMPILER=gcc --strict-warnings no-fips)	30m 59s
minimal (windows-2019)	9m 15s
minimal (windows-2022)	9m 26s
plain (windows-2019)	17m 3s
shared (windows-2019, win64, enable-fips)	28m 59s
plain (windows-2022)	16m 23s
shared (windows-2019, win32, --strict-warnings no-fips)	32m 18s
shared (windows-2022, win64, enable-fips)	28m 34s
shared (windows-2022, win32, --strict-warnings no-fips)	32m 31s
	3h 25m 28s

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