Fixed crash in SDL_PrivateGameControllerRefreshMapping()

(cherry picked from commit 7a9966af9d)

src/joystick/SDL_gamecontroller.c

@@ -1213,8 +1213,6 @@ static void SDL_PrivateGameControllerRefreshMapping(ControllerMapping_t *pContro
                 SDL_PushEvent(&event);
             }
         }
-
-        controller = controller->next;
     }
 }