eliminate small leak

src/main.c

@@ -556,6 +556,8 @@ void clear_lists(main_server_st *s)
 	list_for_each_safe(&s->proc_list.head, ctmp, cpos, list) {
 		if (ctmp->fd >= 0)
 			close(ctmp->fd);
+		if (proc->auth_ctx != NULL)
+			proc_auth_deinit(s, proc);
 		list_del(&ctmp->list);
 		memset(ctmp, 0, sizeof(*ctmp));
 		free(ctmp);