i2c: st: 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: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

Author: Wolfram Sang

drivers/i2c/busses/i2c-st.c

@@ -647,7 +647,7 @@ static int st_i2c_xfer_msg(struct st_i2c_dev *i2c_dev, struct i2c_msg *msg,
 {
 	struct st_i2c_client *c = &i2c_dev->client;
 	u32 ctl, i2c, it;
-	unsigned long timeout;
+	unsigned long time_left;
 	int ret;
 
 	c->addr		= i2c_8bit_addr_from_msg(msg);
@@ -685,11 +685,11 @@ static int st_i2c_xfer_msg(struct st_i2c_dev *i2c_dev, struct i2c_msg *msg,
 		st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STRTG);
 	}
 
-	timeout = wait_for_completion_timeout(&i2c_dev->complete,
-			i2c_dev->adap.timeout);
+	time_left = wait_for_completion_timeout(&i2c_dev->complete,
+						i2c_dev->adap.timeout);
 	ret = c->result;
 
-	if (!timeout)
+	if (!time_left)
 		ret = -ETIMEDOUT;
 
 	i2c = SSC_I2C_STOPG | SSC_I2C_REPSTRTG;