hwmon:(f71882fg) Fix minus temperature

All temperature of Fintek superio hwmonitor that using 1-byte reg will use 2's complement.

In show_temp()

	temp = data->temp[nr] * 1000;

When data->temp[nr] read as 255, it indicate -1C, but this code will report 255C to userspace. It'll be ok when change to:

	temp = ((s8)data->temp[nr]) * 1000;

Signed-off-by Ji-Ze Hong (Peter Hong) <[email protected]>

---
 drivers/hwmon/f71882fg.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

drivers/hwmon/f71882fg.c +3 -2

index 938a8b9ec70d..6830e029995d 100644
@@ -1578,8 +1578,9 @@ static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
 		temp *= 125;
 		if (sign)
 			temp -= 128000;
-	} else
-		temp = data->temp[nr] * 1000;
+	} else {
+		temp = ((s8)data->temp[nr]) * 1000;
+	}
 
 	return sprintf(buf, "%d\n", temp);
 }