spi: spi-fsl-dspi: Remove pointless assignment of master->transfer to NULL

Introduced in commit 9298bc72 ("spi: spi-fsl-dspi: Remove
spi-bitbang") for less than obvious reasons, this assignment is
confusing and serves no purpose.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Link: https://lore.kernel.org/r/20190818180115.31114-9-olteanv@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-fsl-dspi.c

@@ -1006,7 +1006,6 @@ static int dspi_probe(struct platform_device *pdev)
 	dspi->pdev = pdev;
 	dspi->master = master;
 
-	master->transfer = NULL;
 	master->setup = dspi_setup;
 	master->transfer_one_message = dspi_transfer_one_message;
 	master->dev.of_node = pdev->dev.of_node;