Fix new nightly warning #4332

Job	Run time
Rustfmt	7s
Check --no-default-features (nightly)	56s
Check nightly-only targets (nightly)	23s
Check (stable)	6m 11s
Check (nightly)	6m 9s
Check selected Tier 3 platforms (nightly)	4m 46s
Check (1.63)	9m 49s
Test (ubuntu)	42s
Test rustix_use_experimental_asm (powerpc64le-linux)	2m 9s
Test (ubuntu-20.04)	43s
Test (i686-linux)	56s
Test (aarch64-linux)	2m 33s
Test use-libc (ubuntu)	42s
Test (powerpc64le-linux)	2m 6s
Test use-libc (i686-linux)	1m 3s
Test (riscv64-linux)	2m 18s
Test use-libc (aarch64-linux)	2m 40s
Test (s390x-linux)	2m 10s
Test (arm-linux)	2m 18s
Test use-libc (powerpc64le-linux)	2m 6s
Test (ubuntu-stable)	35s
Test (i686-linux-stable)	54s
Test use-libc (riscv64-linux)	2m 12s
Test (aarch64-linux-stable)	2m 26s
Test use-libc (arm-linux)	2m 18s
Test (riscv64-linux-stable)	2m 9s
Test (s390x-linux-stable)	2m 13s
Test (powerpc64le-linux-stable)	2m 14s
Test (arm-linux-stable)	2m 23s
Test (ubuntu-1.63)	1m 38s
Test (i686-linux-1.63)	1m 52s
Test (aarch64-linux-1.63)	3m 31s
Test (riscv64-linux-1.63)	3m 14s
Test (s390x-linux-1.63)	3m 25s
Test (powerpc64le-linux-1.63)	3m 0s
Test (arm-linux-1.63)	3m 20s
Test (macos-latest)	47s
Test (macos-12)	1m 4s
Test (windows)	44s
Test (windows-2019)	46s
Test (musl)	41s
	1h 32m 13s

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