xtea

Fix `clippy::precedence` lints (#466) #67

Job	Run time
build (1.84.0, thumbv7em-none-eabi)	14s
test (1.84.0)	16s
build (1.84.0, wasm32-unknown-unknown)	14s
test (stable)	20s
build (stable, thumbv7em-none-eabi)	15s
build (stable, wasm32-unknown-unknown)	16s
minimal-versions	0s
	1m 35s

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