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>
diff --git a/clients/simple-egl.c b/clients/simple-egl.c
index 12bc93d..c073330 100644
--- a/clients/simple-egl.c
+++ b/clients/simple-egl.c
@@ -676,6 +676,7 @@
 	if (display.compositor)
 		wl_compositor_destroy(display.compositor);
 
+	wl_registry_destroy(display.registry);
 	wl_display_flush(display.display);
 	wl_display_disconnect(display.display);