[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/include/media/v4l2-common.h b/include/media/v4l2-common.h
index 239125a..2d65b35 100644
--- a/include/media/v4l2-common.h
+++ b/include/media/v4l2-common.h
@@ -98,12 +98,12 @@
 /* Control helper functions */
 
 int v4l2_ctrl_check(struct v4l2_ext_control *ctrl, struct v4l2_queryctrl *qctrl,
-		const char **menu_items);
+		const char * const *menu_items);
 const char *v4l2_ctrl_get_name(u32 id);
-const char **v4l2_ctrl_get_menu(u32 id);
+const char * const *v4l2_ctrl_get_menu(u32 id);
 int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, s32 min, s32 max, s32 step, s32 def);
 int v4l2_ctrl_query_menu(struct v4l2_querymenu *qmenu,
-		struct v4l2_queryctrl *qctrl, const char **menu_items);
+		struct v4l2_queryctrl *qctrl, const char * const *menu_items);
 #define V4L2_CTRL_MENU_IDS_END (0xffffffff)
 int v4l2_ctrl_query_menu_valid_items(struct v4l2_querymenu *qmenu, const u32 *ids);