thermal: bcm2835: fix an error code in probe()

This causes a static checker because we're passing a valid pointer to
PTR_ERR().  "err" is already the correct error code, so we can just
delete this line.

Fixes: bcb7dd9ef206 ("thermal: bcm2835: add thermal driver for bcm2835 SoC")
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

drivers/thermal/broadcom/bcm2835_thermal.c

@@ -245,7 +245,6 @@ static int bcm2835_thermal_probe(struct platform_device *pdev)
 		 */
 		err = tz->ops->get_trip_temp(tz, 0, &trip_temp);
 		if (err < 0) {
-			err = PTR_ERR(tz);
 			dev_err(&pdev->dev,
 				"Not able to read trip_temp: %d\n",
 				err);