libsepol/sepol_compute_sid: Do not destroy uninitialized context #583

Job	Run time
build (gcc, 3.12, 3.3)	1m 46s
build (gcc, 3.12, 3.3, test-flags-override)	1m 22s
build (gcc, 3.12, 3.3, test-debug)	1m 24s
build (gcc, 3.12, 3.3, linker-bfd)	1m 40s
build (gcc, 3.12, 3.3, linker-gold)	1m 36s
build (gcc, 3.11, 3.3)	1m 36s
build (gcc, 3.10, 3.3)	1m 32s
build (gcc, 3.9, 3.3)	1m 42s
build (gcc, 3.8, 3.3)	1m 35s
build (gcc, 3.7, 3.3)	1m 44s
build (gcc, pypy3.7, 3.3)	1m 59s
build (gcc, 3.12, 3.2)	2m 21s
build (gcc, 3.12, 3.1)	1m 32s
build (gcc, 3.12, 3.0)	1m 55s
build (gcc, 3.12, 2.7)	1m 52s
build (gcc, 3.12, 2.6)	1m 43s
build (gcc, 3.12, 2.5)	1m 45s
build (clang, 3.12, 3.3)	1m 49s
build (clang, 3.12, 3.3, test-flags-override)	1m 27s
build (clang, 3.12, 3.3, test-debug)	1m 34s
build (clang, 3.11, 3.3)	1m 47s
build (clang, 3.10, 3.3)	2m 6s
build (clang, 3.9, 3.3)	1m 35s
build (clang, 3.8, 3.3)	1m 46s
build (clang, 3.7, 3.3)	1m 42s
build (clang, pypy3.7, 3.3)	2m 19s
build (clang, 3.12, 3.2)	1m 37s
build (clang, 3.12, 3.1)	1m 44s
build (clang, 3.12, 3.0)	1m 38s
build (clang, 3.12, 2.7)	1m 50s
build (clang, 3.12, 2.6)	2m 26s
build (clang, 3.12, 2.5)	1m 44s
build (gcc, 3.12, 3.3, sanitizers)	2m 1s
	58m 9s

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