pointer 'fail_item' used after 'free'

[3reality-wangzhijie]

Compiler warning: pointer 'fail_item' used after 'free' [-Wuse-after-free]

esp-at/components/at/src/at_web_server_cmd.c

Lines 295 to 298 in 59bb9a6

	for (router_obj_t *fail_item = SLIST_FIRST(&s_router_fail_list); fail_item != NULL; fail_item = SLIST_NEXT(fail_item, next)) {
	SLIST_REMOVE(&s_router_fail_list, fail_item, router_obj, next);
	free(fail_item);
	}

SLIST_NEXT(fail_item, next) reference the object(fail_item) which is freed in

esp-at/components/at/src/at_web_server_cmd.c

Line 297 in 59bb9a6

free(fail_item);