spi: fsl-lpspi: 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>
Link: https://lore.kernel.org/r/20240430114142.28551-3-wsa+renesas@sang-engineering.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-fsl-lpspi.c

@@ -553,7 +553,7 @@ static int fsl_lpspi_dma_transfer(struct spi_controller *controller,
 {
 	struct dma_async_tx_descriptor *desc_tx, *desc_rx;
 	unsigned long transfer_timeout;
-	unsigned long timeout;
+	unsigned long time_left;
 	struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;
 	int ret;
 
@@ -594,9 +594,9 @@ static int fsl_lpspi_dma_transfer(struct spi_controller *controller,
 							       transfer->len);
 
 		/* Wait eDMA to finish the data transfer.*/
-		timeout = wait_for_completion_timeout(&fsl_lpspi->dma_tx_completion,
-						      transfer_timeout);
-		if (!timeout) {
+		time_left = wait_for_completion_timeout(&fsl_lpspi->dma_tx_completion,
+							transfer_timeout);
+		if (!time_left) {
 			dev_err(fsl_lpspi->dev, "I/O Error in DMA TX\n");
 			dmaengine_terminate_all(controller->dma_tx);
 			dmaengine_terminate_all(controller->dma_rx);
@@ -604,9 +604,9 @@ static int fsl_lpspi_dma_transfer(struct spi_controller *controller,
 			return -ETIMEDOUT;
 		}
 
-		timeout = wait_for_completion_timeout(&fsl_lpspi->dma_rx_completion,
-						      transfer_timeout);
-		if (!timeout) {
+		time_left = wait_for_completion_timeout(&fsl_lpspi->dma_rx_completion,
+							transfer_timeout);
+		if (!time_left) {
 			dev_err(fsl_lpspi->dev, "I/O Error in DMA RX\n");
 			dmaengine_terminate_all(controller->dma_tx);
 			dmaengine_terminate_all(controller->dma_rx);