staging: bcm2835-camera: constify vb2_ops structures

These vb2_ops structures are only stored in the ops field of a
vb2_queue structure, which is declared as const.  Thus the vb2_ops
structures themselves can be const.

Done with the help of Coccinelle.

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct vb2_ops i@p = { ... };

@ok@
identifier r.i;
struct vb2_queue e;
position p;
@@
e.ops = &i@p;

@bad@
position p != {r.p,ok.p};
identifier r.i;
struct vb2_ops e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct vb2_ops i = { ... };
// </smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c

@@ -642,7 +642,7 @@ static void bm2835_mmal_unlock(struct vb2_queue *vq)
 	mutex_unlock(&dev->mutex);
 }
 
-static struct vb2_ops bm2835_mmal_video_qops = {
+static const struct vb2_ops bm2835_mmal_video_qops = {
 	.queue_setup = queue_setup,
 	.buf_prepare = buffer_prepare,
 	.buf_queue = buffer_queue,