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Fix memory leak #192

Job	Run time
build_and_test (x86, non-SIMD)	7m 2s
build_and_test (x86, SSE2)	1m 53s
build_and_test (x86, auto-selected)	1m 59s
build_and_test (x86_64, non-SIMD)	7m 6s
build_and_test (x86_64, SSE2)	1m 19s
build_and_test (x86_64, auto-selected)	1m 16s
build_and_test (armv7, non-SIMD)	57m 37s
build_and_test (armv7, SSE2)	20s
build_and_test (armv7, auto-selected)	17m 12s
build_and_test (aarch64, non-SIMD)	1h 0m 24s
build_and_test (aarch64, SSE2)	9s
build_and_test (aarch64, auto-selected)	19m 48s
	2h 56m 5s

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