al_destroy_sample - Allegro 5 API
void al_destroy_sample(ALLEGRO_SAMPLE *spl)
Free the sample data structure. If it was created with the free_buf parameter
set to true, then the buffer will be freed with al_free(3alleg5).
This function will stop any sample instances which may be playing
the buffer referenced by the ALLEGRO_SAMPLE(3alleg5).