iio:buffer_cb: Constify iio_cb_access

The iio_cb_access struct is never modified so we can mark it as const.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/buffer_cb.c b/drivers/iio/buffer_cb.c
index 9d19ba7..f406889 100644
--- a/drivers/iio/buffer_cb.c
+++ b/drivers/iio/buffer_cb.c
@@ -21,7 +21,7 @@
 	return cb_buff->cb(data, cb_buff->private);
 }
 
-static struct iio_buffer_access_funcs iio_cb_access = {
+static const struct iio_buffer_access_funcs iio_cb_access = {
 	.store_to = &iio_buffer_cb_store_to,
 };