fix miri test #254

Job	Run time
rustfmt	5s
clippy (ubuntu-latest)	58s
cross (aarch64-unknown-linux-gnu)	1m 30s
clippy (macos-latest)	1m 17s
miri (ubuntu-latest)	2h 52m 40s
cross (aarch64-linux-android)	1m 40s
miri (macos-latest)	2h 52m 23s
clippy (windows-latest)	3m 7s
sanitizer (ubuntu-latest)	4m 55s
cross (aarch64-unknown-linux-musl)	1m 39s
test (ubuntu-latest)	2m 31s
valgrind	2m 35s
cross (i686-linux-android)	1m 45s
test (macos-latest)	1m 21s
cross (x86_64-linux-android)	1m 49s
test (windows-latest)	6m 45s
cross (i686-pc-windows-gnu)	1m 47s
cross (x86_64-pc-windows-gnu)	2m 1s
cross (i686-unknown-linux-gnu)	1m 31s
cross (powerpc64-unknown-linux-gnu)	1m 30s
cross (riscv64gc-unknown-linux-gnu)	1m 32s
cross (wasm32-unknown-unknown)	37s
cross (wasm32-unknown-emscripten)	1m 44s
cargo tarpaulin	5m 17s
	6h 32m 59s

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