(svn r23746) -Fix: also set 'info' to NULL if 'instance' dies (for both AI and GS); avoids invalid memory reads

src/ai/ai_core.cpp

@@ -104,6 +104,7 @@
 
 	delete c->ai_instance;
 	c->ai_instance = NULL;
+	c->ai_info = NULL;
 
 	cur_company.Restore();
 

src/game/game_core.cpp

@@ -94,6 +94,7 @@
 
 	delete Game::instance;
 	Game::instance = NULL;
+	Game::info = NULL;
 
 	cur_company.Restore();