Wayland: Fixed memory leak if output retrieval failed. Found by Cppcheck.
diff --git a/src/video/wayland/SDL_waylandvideo.c b/src/video/wayland/SDL_waylandvideo.c
index 0caa140..ab9aabe 100644
--- a/src/video/wayland/SDL_waylandvideo.c
+++ b/src/video/wayland/SDL_waylandvideo.c
@@ -271,6 +271,7 @@ Wayland_add_display(SDL_VideoData *d, uint32_t id)
output = wl_registry_bind(d->registry, id, &wl_output_interface, 2);
if (!output) {
SDL_SetError("Failed to retrieve output.");
+ SDL_free(display);
return;
}