cpal

chore: fix a clippy warning #846

Job	Run time
android-apk-build	1m 43s
android-check	47s
cargo-publish	0s
asmjs-wasm32-test (wasm32-unknown-emscripten)	56s
clippy-test	45s
ios-build	2m 37s
linux-check-and-test-armv7	1m 57s
macos-test	1m 56s
rustfmt-check	12s
ubuntu-test	35s
wasm32-bindgen-test (wasm32-unknown-unknown)	24s
wasm32-wasi-test (wasm32-wasi)	21s
wasm-beep-build	33s
windows-test (x86_64)	3m 27s
windows-test (i686)	4m 4s
	20m 17s

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