staging:iio:kfifo_buf fix double initialization of the ring device structure.

Looks like this moved into the core at somepoint and kfifo buf got left
behind.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/kfifo_buf.c

@@ -110,9 +110,7 @@ struct iio_ring_buffer *iio_kfifo_allocate(struct iio_dev *indio_dev)
 	iio_ring_buffer_init(&kf->ring, indio_dev);
 	__iio_init_kfifo(kf);
 	kf->ring.dev.type = &iio_kfifo_type;
-	device_initialize(&kf->ring.dev);
 	kf->ring.dev.parent = &indio_dev->dev;
-	kf->ring.dev.bus = &iio_bus_type;
 	dev_set_drvdata(&kf->ring.dev, (void *)&(kf->ring));
 
 	return &kf->ring;