al_win_remove_window_callback - Allegro 5 API

       Removes  the  callback  that  was  previously  registered  with al_win_add_window_callback(3alleg5).  The
       userdata pointer must be the same as what was used during the registration of the callback.

       Returns true if the callback was removed.

       al_win_remove_window_callback - Allegro 5 API

       5.1.2

Allegro reference manual                                                  al_win_remove_window_callback(3alleg5)

              #include <allegro5/allegro_windows.h>

              bool al_win_remove_window_callback(ALLEGRO_DISPLAY *display,
                 bool (*callback)(ALLEGRO_DISPLAY *display, UINT message, WPARAM wparam,
                 LPARAM lparam, LRESULT *result, void *userdata), void *userdata)