spi: spi-fsl-dspi: Drop unneeded use of dataflags bits
Checking directly against pointer value should be at least as fast as doing bitmasking and compare, so let's keep it simple. Signed-off-by: Esben Haabendal <eha@deif.com> Acked-by: Martin Hundebøll <martin@geanix.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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