[media] v4l2-ctrls: use const char * const * for the menu arrays

This prevents checkpatch warnings generated when defining
'static const char *foo[]' arrays. It makes sense to use
const char * const * anyway since the pointers in the array
are indeed const.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/v4l2-common.c b/drivers/media/video/v4l2-common.c
index b5eb1f3..3f0871b 100644
--- a/drivers/media/video/v4l2-common.c
+++ b/drivers/media/video/v4l2-common.c
@@ -150,7 +150,7 @@
    struct v4l2_queryctrl and the available menu items. Note that
    menu_items may be NULL, in that case it is ignored. */
 int v4l2_ctrl_check(struct v4l2_ext_control *ctrl, struct v4l2_queryctrl *qctrl,
-		const char **menu_items)
+		const char * const *menu_items)
 {
 	if (qctrl->flags & V4L2_CTRL_FLAG_DISABLED)
 		return -EINVAL;
@@ -199,7 +199,7 @@
    If menu_items is NULL, then the menu items are retrieved using
    v4l2_ctrl_get_menu. */
 int v4l2_ctrl_query_menu(struct v4l2_querymenu *qmenu, struct v4l2_queryctrl *qctrl,
-	       const char **menu_items)
+	       const char * const *menu_items)
 {
 	int i;
 
@@ -222,7 +222,7 @@
    Use this if there are 'holes' in the list of valid menu items. */
 int v4l2_ctrl_query_menu_valid_items(struct v4l2_querymenu *qmenu, const u32 *ids)
 {
-	const char **menu_items = v4l2_ctrl_get_menu(qmenu->id);
+	const char * const *menu_items = v4l2_ctrl_get_menu(qmenu->id);
 
 	qmenu->reserved = 0;
 	if (menu_items == NULL || ids == NULL)