hwmon: (ntc_thermistor): Fix sparse warnings

Fixes the following sparse warnings:
drivers/hwmon/ntc_thermistor.c:46:31: warning:
symbol 'ncpXXwb473' was not declared. Should it be static?
drivers/hwmon/ntc_thermistor.c:82:31: warning:
symbol 'ncpXXwl333' was not declared. Should it be static?

Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Acked-by: NMyungJoo Ham <myungjoo.ham@samsung.com>
Acked-by: NJean Delvare <khali@linux-fr.org>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>

drivers/hwmon/ntc_thermistor.c

@@ -43,7 +43,7 @@ struct ntc_compensation {
  * The following compensation tables are from the specification of Murata NTC
  * Thermistors Datasheet
  */
-const struct ntc_compensation ncpXXwb473[] = {
+static const struct ntc_compensation ncpXXwb473[] = {
 	{ .temp_C	= -40, .ohm	= 1747920 },
 	{ .temp_C	= -35, .ohm	= 1245428 },
 	{ .temp_C	= -30, .ohm	= 898485 },
@@ -79,7 +79,7 @@ const struct ntc_compensation ncpXXwb473[] = {
 	{ .temp_C	= 120, .ohm	= 1615 },
 	{ .temp_C	= 125, .ohm	= 1406 },
 };
-const struct ntc_compensation ncpXXwl333[] = {
+static const struct ntc_compensation ncpXXwl333[] = {
 	{ .temp_C	= -40, .ohm	= 1610154 },
 	{ .temp_C	= -35, .ohm	= 1130850 },
 	{ .temp_C	= -30, .ohm	= 802609 },