media: radio: si4713: constify static struct v4l2_ioctl_ops

The only usage of radio_si4713_ioctl_ops is to assign its address to the
ioctl_ops field in the video_device struct, which is a pointer to const.
Make it const to allow the compiler to put it in read-only memory.
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/radio/si4713/radio-platform-si4713.c

@@ -110,7 +110,7 @@ static long radio_si4713_default(struct file *file, void *p,
 					  ioctl, cmd, arg);
 }
 
-static struct v4l2_ioctl_ops radio_si4713_ioctl_ops = {
+static const struct v4l2_ioctl_ops radio_si4713_ioctl_ops = {
 	.vidioc_querycap	= radio_si4713_querycap,
 	.vidioc_g_modulator	= radio_si4713_g_modulator,
 	.vidioc_s_modulator	= radio_si4713_s_modulator,