staging:iio:accel:sca3000 Fix a use before setting of the indio_dev->buffer pointer.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>

drivers/staging/iio/accel/sca3000_ring.c

@@ -270,8 +270,8 @@ int sca3000_configure_ring(struct iio_dev *indio_dev)
 		return -ENOMEM;
 	indio_dev->modes |= INDIO_BUFFER_HARDWARE;
 
-	indio_dev->buffer->access = &sca3000_ring_access_funcs;
 
+	buffer->access = &sca3000_ring_access_funcs;
 	iio_device_attach_buffer(indio_dev, buffer);
 
 	return 0;