rem: if (natping_interval > 0) register_timer(timer, NULL, natping_interval);
context: mod_init(void){	get_all_ucontacts =	    (int (*)(void *, int))find_export("~ul_get_all_ucontacts", 1, 0);	if (!get_all_ucontacts) {		LOG(L_ERR, "This module requires usrloc module\n");		return -1;	}	if (natping_interval > 0)		register_timer(timer, NULL, natping_interval);	return 0;}