[PATCH 2/2] hwmon: (sht4x) Fix return value from heater_enable_store()

Sashiko reports:

The return value in heater_enable_store() causes an unexpected write
failure in user-space.

When the heater is successfully enabled, the function returns 0
instead of count:

drivers/hwmon/sht4x.c:heater_enable_store() {
    ...
    data->heating_complete = jiffies + msecs_to_jiffies(heating_time_bound);
    data->data_pending = true;
    return 0;
}

Returning 0 signals to VFS that no bytes were processed. Standard
user-space tools will retry the write with the remaining bytes. On the
retry, time_before(jiffies, data->heating_complete) evaluates to true,
and the function immediately fails with -EBUSY.

Return count as expected to fix the problem.

Fixes: 0eed6fc3d2b9e ("hwmon: (sht4x): add heater support")
Cc: Antoni Pokusinski <[email protected]>
Cc: Alessandro Zini <[email protected]>
Signed-off-by: Guenter Roeck <[email protected]>
---
 drivers/hwmon/sht4x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwmon/sht4x.c b/drivers/hwmon/sht4x.c
index 7a0dc2ed723d..a97dda9e92dc 100644
--- a/drivers/hwmon/sht4x.c
+++ b/drivers/hwmon/sht4x.c
@@ -288,7 +288,7 @@ static ssize_t heater_enable_store(struct device *dev,
 
 	data->heating_complete = jiffies + msecs_to_jiffies(heating_time_bound);
 	data->data_pending = true;
-	return 0;
+	return count;
 }
 
 static ssize_t heater_power_show(struct device *dev,
-- 
2.45.2