spi: xlp: 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.

Fix to the proper variable type 'unsigned long' while here.

Signed-off-by: Wolfram Sang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-xlp.c

···
 		const unsigned char *tx_buf,
 		unsigned char *rx_buf, int xfer_len, int cmd_cont)
 {
-	int timeout;
+	unsigned long time_left;
 	u32 intr_mask = 0;
 
 	xs->tx_buf = tx_buf;
···
 	intr_mask |= XLP_SPI_INTR_DONE;
 	xlp_spi_reg_write(xs, xs->cs, XLP_SPI_INTR_EN, intr_mask);
 
-	timeout = wait_for_completion_timeout(&xs->done,
-				msecs_to_jiffies(1000));
+	time_left = wait_for_completion_timeout(&xs->done,
+						msecs_to_jiffies(1000));
 	/* Disable interrupts */
 	xlp_spi_reg_write(xs, xs->cs, XLP_SPI_INTR_EN, 0x0);
-	if (!timeout) {
+	if (!time_left) {
 		dev_err(&xs->dev, "xfer timedout!\n");
 		goto out;
 	}