Fix memory leak

src/states_screens/gp_info_screen.cpp

@@ -511,3 +511,10 @@ void GPInfoScreen::updateHighscores()
         m_highscore_list->addItem(StringUtils::toString(i),row);
     }
 }   // updateHighscores
+
+// -----------------------------------------------------------------------
+void GPInfoScreen::unloaded()
+{
+    delete m_icon_bank;
+    m_icon_bank = NULL;
+}   // unloaded

src/states_screens/gp_info_screen.hpp

@@ -108,6 +108,7 @@ public:
     virtual void onUpdate(float dt) OVERRIDE;
 
     void setGP(const std::string &gp_ident);
+    virtual void unloaded() OVERRIDE;
 };   // GPInfoScreen
 
 #endif