rem: LOG(L_ERR, "notify_winfo_watchers: presentity=%.*s winfo_watchers=%p\n", _p->uri.len, _p->uri.s, watcher);
add: if (watcher) LOG(L_ERR, "notify_winfo_watchers: presentity=%.*s winfo_watchers=%p\n", _p->uri.len, _p->uri.s, watcher);
context: int notify_winfo_watchers(presentity_t* _p){	struct watcher* watcher;	watcher = _p->winfo_watchers;	LOG(L_ERR, "notify_winfo_watchers: presentity=%.*s winfo_watchers=%p\n", _p->uri.len, _p->uri.s, watcher);	while(watcher) {		LOG(L_ERR, "notify_winfo_watchers: watcher=%.*s\n", watcher->uri.len, watcher->uri.s);		send_notify(_p, watcher);		watcher = watcher->next;	}	/* clear the watcherinfo changed flag */	_p->flags &= ~PFLAG_WATCHERINFO_CHANGED;	return 0;}