libsepol/sepol_compute_sid: Do not destroy uninitialized context #151

Job	Run time
build (gcc, 3.11, 3.1)	23s
build (gcc, 3.11, 3.1, test-flags-override)	1s
build (gcc, 3.11, 3.1, test-debug)	1s
build (gcc, 3.11, 3.1, linker-bfd)	21s
build (gcc, 3.11, 3.1, linker-gold)	19s
build (gcc, 3.10, 3.1)	21s
build (gcc, 3.9, 3.1)	1s
build (gcc, 3.8, 3.1)	1s
build (gcc, 3.7, 3.1)	1s
build (gcc, pypy3.7, 3.1)	1s
build (gcc, 3.11, 3.0)	21s
build (gcc, 3.11, 2.7)	8s
build (gcc, 3.11, 2.6)	9s
build (gcc, 3.11, 2.5)	9s
build (clang, 3.11, 3.1)	23s
build (clang, 3.11, 3.1, test-flags-override)	23s
build (clang, 3.11, 3.1, test-debug)	22s
build (clang, 3.10, 3.1)	23s
build (clang, 3.9, 3.1)	21s
build (clang, 3.8, 3.1)	10s
build (clang, 3.7, 3.1)	6s
build (clang, pypy3.7, 3.1)	9s
build (clang, 3.11, 3.0)	23s
build (clang, 3.11, 2.7)	9s
build (clang, 3.11, 2.6)	12s
build (clang, 3.11, 2.5)	11s
build (gcc, 3.11, 3.1, sanitizers)	1s
	5m 30s

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