thermal: core: remove unnecessary check in trip_point_hyst_store()

This code was shuffled around a bit recently.  We no longer need to
check the value of "ret" because we know it's zero.

Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: Dan Carpenter

drivers/thermal/thermal_sysfs.c

@@ -181,7 +181,7 @@ trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 
 	mutex_unlock(&tz->lock);
 
-	return ret ? ret : count;
+	return count;
 }
 
 static ssize_t