thermal: int3403: Delete a check before thermal_zone_device_unregister()

The thermal_zone_device_unregister() function tests whether its argument
is NULL and then returns immediately. Thus the test around the call
is not needed.

This issue was detected by using the Coccinelle software.
Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net>
Signed-off-by: NZhang Rui <rui.zhang@intel.com>

drivers/thermal/int340x_thermal/int3403_thermal.c

@@ -293,7 +293,6 @@ static int int3403_sensor_add(struct int3403_priv *priv)
 	return 0;
 
  err_free_obj:
-	if (obj->tzone)
 	thermal_zone_device_unregister(obj->tzone);
 	return result;
 }