Use zalloc instead of malloc + memset

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Marek Chalupa <mchqwerty@gmail.com>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com>

src/wayland-private.h

@@ -29,6 +29,7 @@
 #define WAYLAND_PRIVATE_H
 
 #include <stdarg.h>
+#include <stdlib.h>
 
 #define WL_HIDE_DEPRECATED 1
 
@@ -216,4 +217,10 @@ struct wl_display;
 struct wl_array *
 wl_display_get_additional_shm_formats(struct wl_display *display);
 
+static inline void *
+zalloc(size_t s)
+{
+	return calloc(1, s);
+}
+
 #endif