There may be error returns from kevent, don't assert there are none.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@972 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_acceptor_kqueue.c

@@ -41,7 +41,8 @@ vca_kq_sess(struct sess *sp, int arm)
 		return;
 	EV_SET(&ki[nki], sp->fd, EVFILT_READ, arm, 0, 0, sp);
 	if (++nki == NKEV) {
-		AZ(kevent(kq, ki, nki, NULL, 0, NULL));
+		(void)kevent(kq, ki, nki, NULL, 0, NULL);
+		/* XXX: we could check the error returns here */
 		nki = 0;
 	}
 }