compositor: Call wlsc_buffer_attach() after setting es->width

Otherwise we end up with a 0 pitch.

compositor/compositor.c

@@ -860,8 +860,6 @@ surface_attach(struct wl_client *client,
 	 * damaged by the client. */
 	wlsc_surface_damage(es);
 
-	wlsc_buffer_attach(buffer, surface);
-
 	switch (es->map_type) {
 	case WLSC_SURFACE_MAP_FULLSCREEN:
 		es->x = (es->fullscreen_output->width - es->width) / 2;
@@ -877,6 +875,8 @@ surface_attach(struct wl_client *client,
 	if (x != 0 || y != 0)
 		wlsc_surface_assign_output(es);
 
+	wlsc_buffer_attach(buffer, surface);
+
 	es->compositor->shell->attach(es->compositor->shell, es);
 }