media: go7007: Constify static struct snd_device_ops

The only usage of go7007_snd_device_ops is to pass its address to
snd_device_new() which takes a pointer to const struct snd_device_ops.
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>

drivers/media/usb/go7007/snd-go7007.c

@@ -191,7 +191,7 @@ static int go7007_snd_free(struct snd_device *device)
 	return 0;
 }
 
-static struct snd_device_ops go7007_snd_device_ops = {
+static const struct snd_device_ops go7007_snd_device_ops = {
 	.dev_free	= go7007_snd_free,
 };