rem: cbuf_free_chain(keyboard_buf);
add: delete_packet_buffer(sKeyBuffer);
context: keyboard_close(void *cookie){	remove_io_interrupt_handler(1, &handle_keyboard_interrupt, NULL);	cbuf_free_chain(keyboard_buf);	delete_sem(sKeyboardSem);	//mutex_destroy(&keyboard_read_mutex);		atomic_and(&gKeyboardOpenMask, 0);		return B_OK;}