media: staging: media: rkvdec: Constify static struct v4l2_m2m_ops

The only usage of rkvdec_m2m_ops is to pass its address to v4l2_m2m_init(),
which takes a pointer to const v4l2_m2m_ops as argument. Make it const
to allow the compiler to put it in read-only memory.
Signed-off-by: NRikard Falkeborn <rikard.falkeborn@gmail.com>
Reviewed-by: NEzequiel Garcia <ezequiel@vanguardiasur.com.ar>
Reviewed-by: NKieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: NHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/rkvdec/rkvdec.c

@@ -712,7 +712,7 @@ static void rkvdec_device_run(void *priv)
 		rkvdec_job_finish(ctx, VB2_BUF_STATE_ERROR);
 }
 
-static struct v4l2_m2m_ops rkvdec_m2m_ops = {
+static const struct v4l2_m2m_ops rkvdec_m2m_ops = {
 	.device_run = rkvdec_device_run,
 };