Added appropriate delete statements.

src/dawn/input/_InputManager.hpp

@@ -6,6 +6,7 @@
 #pragma once
 #include "dawnlibs.hpp"
 #include "util/mathutils.hpp"
+#include "assert/assert.hpp"
 
 namespace Dawn {
   class DawnGame;
@@ -32,6 +33,7 @@ namespace Dawn {
       DawnGame *game;
 
       IInputManager(DawnGame *game) {
+        assertNotNull(game);
         this->game = game;
       }