[media] vivi: drop unused field

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/platform/vivi.c

@@ -191,7 +191,6 @@ struct vivi_buffer {
 	/* common v4l buffer stuff -- must be first */
 	struct vb2_buffer	vb;
 	struct list_head	list;
-	const struct vivi_fmt  *fmt;
 };
 
 struct vivi_dmaqueue {
@@ -875,8 +874,6 @@ static int buffer_prepare(struct vb2_buffer *vb)
 
 	vb2_set_plane_payload(&buf->vb, 0, size);
 
-	buf->fmt = dev->fmt;
-
 	precalculate_bars(dev);
 	precalculate_line(dev);