spi: spi-imx: use "controller" variable consistently in spi_imx_probe()

Near the top of the function, spi_imx->controller is set to
controller (and is of course never modified again). The rest of the
function uses a mix of the two expressions.

For consistency, readability and better code generation, drop all the
spi_imx-> indirections.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20230425134527.483607-2-linux@rasmusvillemoes.dk
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Villemoes

drivers/spi/spi-imx.c

@@ -1737,20 +1737,20 @@ static int spi_imx_probe(struct platform_device *pdev)
 	else
 		controller->num_chipselect = 3;
 
-	spi_imx->controller->transfer_one = spi_imx_transfer_one;
-	spi_imx->controller->setup = spi_imx_setup;
-	spi_imx->controller->cleanup = spi_imx_cleanup;
-	spi_imx->controller->prepare_message = spi_imx_prepare_message;
-	spi_imx->controller->unprepare_message = spi_imx_unprepare_message;
-	spi_imx->controller->slave_abort = spi_imx_slave_abort;
-	spi_imx->controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_NO_CS;
+	controller->transfer_one = spi_imx_transfer_one;
+	controller->setup = spi_imx_setup;
+	controller->cleanup = spi_imx_cleanup;
+	controller->prepare_message = spi_imx_prepare_message;
+	controller->unprepare_message = spi_imx_unprepare_message;
+	controller->slave_abort = spi_imx_slave_abort;
+	controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_NO_CS;
 
 	if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx) ||
 	    is_imx53_ecspi(spi_imx))
-		spi_imx->controller->mode_bits |= SPI_LOOP | SPI_READY;
+		controller->mode_bits |= SPI_LOOP | SPI_READY;
 
 	if (is_imx51_ecspi(spi_imx) || is_imx53_ecspi(spi_imx))
-		spi_imx->controller->mode_bits |= SPI_RX_CPHA_FLIP;
+		controller->mode_bits |= SPI_RX_CPHA_FLIP;
 
 	if (is_imx51_ecspi(spi_imx) &&
 	    device_property_read_u32(&pdev->dev, "cs-gpios", NULL))
@@ -1759,7 +1759,7 @@ static int spi_imx_probe(struct platform_device *pdev)
 		 * setting the burst length to the word size. This is
 		 * considerably faster than manually controlling the CS.
 		 */
-		spi_imx->controller->mode_bits |= SPI_CS_WORD;
+		controller->mode_bits |= SPI_CS_WORD;
 
 	spi_imx->spi_drctl = spi_drctl;