iio: chemical: atlas-ph-sensor: fix typo in val assignment

Fix an incorrect assignment due to a typo on a variable name. The
variable val2 should be assigned 100000 and not val.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-By: Matt Ranostay <mranostay@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/chemical/atlas-ph-sensor.c

@@ -434,7 +434,7 @@ static int atlas_read_raw(struct iio_dev *indio_dev,
 			break;
 		case IIO_ELECTRICALCONDUCTIVITY:
 			*val = 1; /* 0.00001 */
-			*val = 100000;
+			*val2 = 100000;
 			break;
 		case IIO_CONCENTRATION:
 			*val = 0; /* 0.000000001 */