staging: iio: sca3000 add _index attribute registration

Signed-off-by: NJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: NManuel Stahl <manuel.stahl@iis.fraunhofer.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/accel/sca3000_ring.c

@@ -206,8 +206,11 @@ static IIO_DEVICE_ATTR(accel_type,
 
 static struct attribute *sca3000_scan_el_attrs[] = {
 	&iio_scan_el_accel_x.dev_attr.attr,
+	&iio_const_attr_accel_x_index.dev_attr.attr,
 	&iio_scan_el_accel_y.dev_attr.attr,
+	&iio_const_attr_accel_y_index.dev_attr.attr,
 	&iio_scan_el_accel_z.dev_attr.attr,
+	&iio_const_attr_accel_z_index.dev_attr.attr,
 	&iio_const_attr_accel_type_available.dev_attr.attr,
 	&iio_dev_attr_accel_type.dev_attr.attr,
 	NULL