cpal

Fix minor variable mixup (#854) #824

Job	Run time
cargo-publish	12s
clippy-test	47s
rustfmt-check	4s
ubuntu-test	1m 3s
asmjs-wasm32-test (wasm32-unknown-emscripten)	44s
linux-check-and-test-armv7	1m 46s
macos-test	1m 51s
wasm32-bindgen-test (wasm32-unknown-unknown)	30s
wasm32-wasi-test (wasm32-wasi)	22s
windows-test (x86_64)	2m 5s
android-apk-build	1m 34s
windows-test (i686)	2m 14s
android-check	34s
ios-build	2m 35s
wasm-beep-build	32s
	16m 53s

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