Allow different lengths of buffers in hal_1 SpiBus impl #566
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In
SpiBus::transfer
From embedded-hal docs:
Current implementation requires the lengths to be equal:
https://github.com/stm32-rs/stm32f4xx-hal/blob/master/src/spi/hal_1.rs#L88
So I changed it accordingly. Please let me know if line 103 is needed.