Fix a test on wasm #888

Job	Run time
Clippy	2m 30s
Smoke-test fuzzing targets	1m 59s
Clippy (--no-default-features --features="c-allocator")	20s
QEMU build & test (stable, ubuntu-latest, s390x-unknown-linux-gnu, s390x-linux-gnu-gcc)	46s
Smoke-test fuzzing targets (--no-default-features --features="c-allocator")	48s
Clippy (--no-default-features --features="rust-allocator")	32s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	49s
QEMU build & test (stable, ubuntu-latest, i686-unknown-linux-gnu, i686-linux-gnu-gcc)	40s
Smoke-test fuzzing targets (--no-default-features --features="rust-allocator")	49s
Build and test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	56s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	55s
Smoke-test fuzzing targets (stable, macos-14, aarch64-apple-darwin)	1m 58s
Build and test (stable, macos-latest, x86_64-apple-darwin)	1m 10s
dynamic library	12s
Miri	2m 34s
Build and test (stable, macos-14, aarch64-apple-darwin)	56s
Build and test (stable-x86_64-gnu, windows-2022, x86_64-pc-windows-gnu)	1m 32s
wasm32	45s
	20m 11s

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