scanner: Initialize wl_message structs completely
scanner: Initialize wl_message structs completely

tulcod/wayland,eyolfson/wayland,bitfactor/wayland,tulcod/wayland,sir-murray/wayland,sir-murray/wayland,abooij/wayland,mchalupa/wayland,tulcod/wayland,eyolfson/wayland,sir-murray/wayland,bitfactor/wayland,abooij/wayland,bitfactor/wayland,abooij/wayland,mchalupa/wayland,mchalupa/wayland,eyolfson/wayland