desktop-shell: call weston_layer_fini()

This ensures the layers are torn down properly.

See commit: libweston: add weston_layer_fini()

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

desktop-shell/shell.c

@@ -894,6 +894,8 @@ workspace_destroy(struct workspace *ws)
 	if (ws->fsurf_back)
 		focus_surface_destroy(ws->fsurf_back);
 
+	weston_layer_fini(&ws->layer);
+
 	free(ws);
 }
 
@@ -5026,6 +5028,13 @@ shell_destroy(struct wl_listener *listener, void *data)
 		workspace_destroy(*ws);
 	wl_array_release(&shell->workspaces.array);
 
+	weston_layer_fini(&shell->fullscreen_layer);
+	weston_layer_fini(&shell->panel_layer);
+	weston_layer_fini(&shell->background_layer);
+	weston_layer_fini(&shell->lock_layer);
+	weston_layer_fini(&shell->input_panel_layer);
+	weston_layer_fini(&shell->minimized_layer);
+
 	free(shell->client);
 	free(shell);
 }