ALSA: aoa: soundbus: i2sbus: pcm: 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 <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20240430121028.30443-1-wsa+renesas@sang-engineering.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: Wolfram Sang

sound/aoa/soundbus/i2sbus/pcm.c

@@ -255,24 +255,24 @@ static void i2sbus_wait_for_stop(struct i2sbus_dev *i2sdev,
 {
 	unsigned long flags;
 	DECLARE_COMPLETION_ONSTACK(done);
-	long timeout;
+	unsigned long time_left;
 
 	spin_lock_irqsave(&i2sdev->low_lock, flags);
 	if (pi->dbdma_ring.stopping) {
 		pi->stop_completion = &done;
 		spin_unlock_irqrestore(&i2sdev->low_lock, flags);
-		timeout = wait_for_completion_timeout(&done, HZ);
+		time_left = wait_for_completion_timeout(&done, HZ);
 		spin_lock_irqsave(&i2sdev->low_lock, flags);
 		pi->stop_completion = NULL;
-		if (timeout == 0) {
+		if (time_left == 0) {
 			/* timeout expired, stop dbdma forcefully */
 			printk(KERN_ERR "i2sbus_wait_for_stop: timed out\n");
 			/* make sure RUN, PAUSE and S0 bits are cleared */
 			out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
 			pi->dbdma_ring.stopping = 0;
-			timeout = 10;
+			time_left = 10;
 			while (in_le32(&pi->dbdma->status) & ACTIVE) {
-				if (--timeout <= 0)
+				if (--time_left <= 0)
 					break;
 				udelay(1);
 			}