HevJNI: Fix missing mutex unlock. #32

Job	Run time
LLVM	23s
Source	0s
macOS	1m 14s
Linux (arm64, aarch64-unknown-linux-musl)	17s
Linux (arm32, arm-unknown-linux-musleabi)	9s
Linux (arm32hf, arm-unknown-linux-musleabihf)	15s
Linux (loong64, loongarch64-unknown-linux-musl)	13s
Linux (m68k, m68k-unknown-linux-musl)	9s
Linux (microblazeel, microblazeel-xilinx-linux-musl)	13s
Linux (microblaze, microblaze-xilinx-linux-musl)	13s
Linux (mips64el, mips64el-unknown-linux-musl)	15s
Linux (mips64, mips64-unknown-linux-musl)	15s
Linux (mips32el, mipsel-unknown-linux-musl)	10s
Linux (mips32elsf, mipsel-unknown-linux-muslsf)	8s
Linux (mips32, mips-unknown-linux-musl)	8s
Linux (mips32sf, mips-unknown-linux-muslsf)	8s
Linux (powerpc64, powerpc64-unknown-linux-musl)	10s
Linux (powerpc, powerpc-unknown-linux-musl)	10s
Linux (riscv32, riscv32-unknown-linux-musl)	12s
Linux (riscv64, riscv64-unknown-linux-musl)	17s
Linux (s390x, s390x-ibm-linux-musl)	14s
Linux (sh, sh-multilib-linux-musl)	14s
Linux (sheb, sh-multilib-linux-musl, -mb)	12s
Linux (x86_32, x86_64-multilib-linux-musl, -m32)	10s
Linux (x86_64, x86_64-multilib-linux-musl)	11s
	6m 0s

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