hwmon: (emc6w201) Fix DIV_ROUND_CLOSEST problem with unsigned divisors

Result of DIV_ROUND_CLOSEST is undefined for negative dividends if the divisor
variable type is unsigned. Fix by declaring divisor as signed variable.
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Acked-by: NJean Delvare <khali@linux-fr.org>

drivers/hwmon/emc6w201.c

@@ -187,7 +187,7 @@ static struct emc6w201_data *emc6w201_update_device(struct device *dev)
  * Sysfs callback functions
  */
 
-static const u16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 };
+static const s16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 };
 
 static ssize_t show_in(struct device *dev, struct device_attribute *devattr,
 	char *buf)