iio:humidity:si7020: cleanup read_raw and probe

When reading temperature or humidity values, a shift of two bits to the right
needs to be applied, and only for the humidity channel a mask of the lower
12 bits needs to be applied. This reduces code repetition.
During probe, i2c_set_clientdata() was used, although its counterpart was not,
so drop it.
Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/humidity/si7020.c

@@ -56,10 +56,9 @@ static int si7020_read_raw(struct iio_dev *indio_dev,
 					       SI7020CMD_RH_HOLD);
 		if (ret < 0)
 			return ret;
-		if (chan->type == IIO_TEMP)
-			*val = ret >> 2;
-		else
-			*val = (ret & 0x3FFF) >> 2;
+		*val = ret >> 2;
+		if (chan->type == IIO_HUMIDITYRELATIVE)
+			*val &= GENMASK(11, 0);
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
 		if (chan->type == IIO_TEMP)
@@ -133,7 +132,6 @@ static int si7020_probe(struct i2c_client *client,
 
 	data = iio_priv(indio_dev);
 	*data = client;
-	i2c_set_clientdata(client, indio_dev);
 
 	indio_dev->dev.parent = &client->dev;
 	indio_dev->name = dev_name(&client->dev);