i2c: digicolor: 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>
Acked-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

Author: Wolfram Sang

drivers/i2c/busses/i2c-digicolor.c

@@ -213,7 +213,7 @@ static irqreturn_t dc_i2c_irq(int irq, void *dev_id)
 static int dc_i2c_xfer_msg(struct dc_i2c *i2c, struct i2c_msg *msg, int first,
 			   int last)
 {
-	unsigned long timeout = msecs_to_jiffies(TIMEOUT_MS);
+	unsigned long time_left = msecs_to_jiffies(TIMEOUT_MS);
 	unsigned long flags;
 
 	spin_lock_irqsave(&i2c->lock, flags);
@@ -227,9 +227,9 @@ static int dc_i2c_xfer_msg(struct dc_i2c *i2c, struct i2c_msg *msg, int first,
 	dc_i2c_start_msg(i2c, first);
 	spin_unlock_irqrestore(&i2c->lock, flags);
 
-	timeout = wait_for_completion_timeout(&i2c->done, timeout);
+	time_left = wait_for_completion_timeout(&i2c->done, time_left);
 	dc_i2c_set_irq(i2c, 0);
-	if (timeout == 0) {
+	if (time_left == 0) {
 		i2c->state = STATE_IDLE;
 		return -ETIMEDOUT;
 	}