[PATCH wayland] utils: const-ify some function arguments

[Giulio Camuffo]

---
 src/wayland-util.c | 4 ++--
 src/wayland-util.h | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/wayland-util.c b/src/wayland-util.c
index 4ab1f5a..598ab42 100644
--- a/src/wayland-util.c
+++ b/src/wayland-util.c
@@ -55,7 +55,7 @@ wl_list_remove(struct wl_list *elm)
 }
 
 WL_EXPORT int
-wl_list_length(struct wl_list *list)
+wl_list_length(const struct wl_list *list)
 {
 	struct wl_list *e;
 	int count;
@@ -71,7 +71,7 @@ wl_list_length(struct wl_list *list)
 }
 
 WL_EXPORT int
-wl_list_empty(struct wl_list *list)
+wl_list_empty(const struct wl_list *list)
 {
 	return list->next == list;
 }
diff --git a/src/wayland-util.h b/src/wayland-util.h
index 4728aaa..dbe05a5 100644
--- a/src/wayland-util.h
+++ b/src/wayland-util.h
@@ -105,8 +105,8 @@ struct wl_list {
 void wl_list_init(struct wl_list *list);
 void wl_list_insert(struct wl_list *list, struct wl_list *elm);
 void wl_list_remove(struct wl_list *elm);
-int wl_list_length(struct wl_list *list);
-int wl_list_empty(struct wl_list *list);
+int wl_list_length(const struct wl_list *list);
+int wl_list_empty(const struct wl_list *list);
 void wl_list_insert_list(struct wl_list *list, struct wl_list *other);
 
 #ifdef __GNUC__
-- 
1.8.2