staging: iio: Move from class to bus

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/iio/ring_sw.c b/drivers/staging/iio/ring_sw.c
index e9570e3..f8de45d 100644
--- a/drivers/staging/iio/ring_sw.c
+++ b/drivers/staging/iio/ring_sw.c
@@ -419,7 +419,7 @@
 	buf->dev.type = &iio_sw_ring_type;
 	device_initialize(&buf->dev);
 	buf->dev.parent = &indio_dev->dev;
-	buf->dev.class = &iio_class;
+	buf->dev.bus = &iio_bus_type;
 	dev_set_drvdata(&buf->dev, (void *)buf);
 
 	return buf;