hwmon: (ina2xx) Fix current value calculation

The current register (04h) has a sign bit at MSB. The comments for this calculation also mention that it's a signed register.

However, the regval is unsigned type so result of calculation turns out to be an incorrect value when current is negative.

This patch simply fixes this by adding a casting to s16.

---
 drivers/hwmon/ina2xx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index c2252cf452f5..07ee19573b3f 100644
@@ -274,7 +274,7 @@ static int ina2xx_get_value(struct ina2xx_data *data, u8 reg,
 		break;
 	case INA2XX_CURRENT:
 		/* signed register, result in mA */
-		val = regval * data->current_lsb_uA;
+		val = (s16)regval * data->current_lsb_uA;
 		val = DIV_ROUND_CLOSEST(val, 1000);
 		break;
 	case INA2XX_CALIBRATION:

2.17.1