Null terminate the right buffer....

src/accept.c

@@ -791,7 +791,7 @@ struct client_t *accept_client_for_listener(struct listen_t *l, int fd, char *ad
 	}
 	if (l->filter_s) {
 		strncpy(c->filter_s, l->filter_s, sizeof(c->filter_s));
-		l->filter_s[FILTER_S_SIZE-1] = 0;
+		c->filter_s[FILTER_S_SIZE-1] = 0;
 	}
 	
 	return c;