[PATCH] virtio_snd.h: clarify that `controls` depends on VIRTIO_SND_F_CTLS

[Stefano Garzarella]

As defined in the specification, the `controls` field in the configuration
space is only valid/present if VIRTIO_SND_F_CTLS is negotiated.

  From https://docs.oasis-open.org/virtio/virtio/v1.3/virtio-v1.3.html:

  5.14.4 Device Configuration Layout
    ...
    controls
       (driver-read-only) indicates a total number of all available control
       elements if VIRTIO_SND_F_CTLS has been negotiated.

Let's use the same style used in virtio_blk.h to clarify this and to avoid
confusion as happened in QEMU (see link).

Link: https://gitlab.com/qemu-project/qemu/-/issues/2805
Signed-off-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>
---
 include/uapi/linux/virtio_snd.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/linux/virtio_snd.h b/include/uapi/linux/virtio_snd.h
index 5f4100c2cf04..a4cfb9f6561a 100644
--- a/include/uapi/linux/virtio_snd.h
+++ b/include/uapi/linux/virtio_snd.h
@@ -25,7 +25,7 @@ struct virtio_snd_config {
 	__le32 streams;
 	/* # of available channel maps */
 	__le32 chmaps;
-	/* # of available control elements */
+	/* # of available control elements (if VIRTIO_SND_F_CTLS) */
 	__le32 controls;
 };
 
-- 
2.48.1