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spi/xilinx: Make spi_tx and spi_rx simmetric
spi_rx handles the case where the buffer is null. Nevertheless spi_tx did not handle it, and was handled by the caller function. Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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