spi: imx: use 'time_left' variable with wait_for_completion_timeout()

There is a confusing pattern in the kernel to use a variable named 'timeout' to
store the result of wait_for_completion_timeout() causing patterns like:

	timeout = wait_for_completion_timeout(...)
	if (!timeout) return -ETIMEDOUT;

with all kinds of permutations. Use 'time_left' as a variable to make the code
self explaining.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20240430114142.28551-4-wsa+renesas@sang-engineering.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Wolfram Sang

drivers/spi/spi-imx.c

@@ -1405,7 +1405,7 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
 {
 	struct dma_async_tx_descriptor *desc_tx, *desc_rx;
 	unsigned long transfer_timeout;
-	unsigned long timeout;
+	unsigned long time_left;
 	struct spi_controller *controller = spi_imx->controller;
 	struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;
 	struct scatterlist *last_sg = sg_last(rx->sgl, rx->nents);
@@ -1471,18 +1471,18 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
 	transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
 
 	/* Wait SDMA to finish the data transfer.*/
-	timeout = wait_for_completion_timeout(&spi_imx->dma_tx_completion,
+	time_left = wait_for_completion_timeout(&spi_imx->dma_tx_completion,
 						transfer_timeout);
-	if (!timeout) {
+	if (!time_left) {
 		dev_err(spi_imx->dev, "I/O Error in DMA TX\n");
 		dmaengine_terminate_all(controller->dma_tx);
 		dmaengine_terminate_all(controller->dma_rx);
 		return -ETIMEDOUT;
 	}
 
-	timeout = wait_for_completion_timeout(&spi_imx->dma_rx_completion,
-					      transfer_timeout);
-	if (!timeout) {
+	time_left = wait_for_completion_timeout(&spi_imx->dma_rx_completion,
+						transfer_timeout);
+	if (!time_left) {
 		dev_err(&controller->dev, "I/O Error in DMA RX\n");
 		spi_imx->devtype_data->reset(spi_imx);
 		dmaengine_terminate_all(controller->dma_rx);
@@ -1501,7 +1501,7 @@ static int spi_imx_pio_transfer(struct spi_device *spi,
 {
 	struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
 	unsigned long transfer_timeout;
-	unsigned long timeout;
+	unsigned long time_left;
 
 	spi_imx->tx_buf = transfer->tx_buf;
 	spi_imx->rx_buf = transfer->rx_buf;
@@ -1517,9 +1517,9 @@ static int spi_imx_pio_transfer(struct spi_device *spi,
 
 	transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
 
-	timeout = wait_for_completion_timeout(&spi_imx->xfer_done,
-					      transfer_timeout);
-	if (!timeout) {
+	time_left = wait_for_completion_timeout(&spi_imx->xfer_done,
+						transfer_timeout);
+	if (!time_left) {
 		dev_err(&spi->dev, "I/O Error in PIO\n");
 		spi_imx->devtype_data->reset(spi_imx);
 		return -ETIMEDOUT;