clients: destroy wl_registry on exit

Plug an insignificant memory leak in demo programs that bother to clean
up at all.

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>

clients/simple-egl.c

@@ -676,6 +676,7 @@ main(int argc, char **argv)
 	if (display.compositor)
 		wl_compositor_destroy(display.compositor);
 
+	wl_registry_destroy(display.registry);
 	wl_display_flush(display.display);
 	wl_display_disconnect(display.display);
 

clients/simple-shm.c

@@ -369,6 +369,7 @@ destroy_display(struct display *display)
 	if (display->compositor)
 		wl_compositor_destroy(display->compositor);
 
+	wl_registry_destroy(display->registry);
 	wl_display_flush(display->display);
 	wl_display_disconnect(display->display);
 	free(display);

clients/window.c

@@ -4314,6 +4314,7 @@ display_destroy(struct display *display)
 		wl_data_device_manager_destroy(display->data_device_manager);
 
 	wl_compositor_destroy(display->compositor);
+	wl_registry_destroy(display->registry);
 
 	close(display->epoll_fd);