[gnome-chess] Don't try to stop game twice on engine bug

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 9f9afa40443bf4f10f759996c5c7ec3bce08cc5b
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Wed Jun 25 10:39:58 2014 -0500

    Don't try to stop game twice on engine bug

 src/gnome-chess.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/gnome-chess.vala b/src/gnome-chess.vala
index d4ea2b4..cc53606 100644
--- a/src/gnome-chess.vala
+++ b/src/gnome-chess.vala
@@ -739,7 +739,7 @@ public class ChessApplication : Gtk.Application
          */
         var original_game = game;
         Timeout.add_seconds (2, () => {
-            if (game == original_game)
+            if (game == original_game && game.is_started)
                 game.stop (ChessResult.BUG, ChessRule.BUG);
             /* Disconnect from the main loop */
             return false;