tcp: Fix out-of-bounds access for twsk in tcp_ao_established_key().

In the Linux kernel, the following vulnerability has been resolved:

tcp: Fix out-of-bounds access for twsk in tcp_ao_established_key().

lockdep_sock_is_held() was added in tcp_ao_established_key()

by the cited commit.

It can be called from tcp_v[46]_timewait_ack() with twsk.

Since it does not have sk->sk_lock, the lockdep annotation

results in out-of-bound access.

$ pahole -C tcp_timewait_sock vmlinux | grep size

/* size: 288, cachelines: 5, members: 8 */

$ pahole -C sock vmlinux | grep sk_lock

socket_lock_t sk_lock; /* 440 192 */

Let's not use lockdep_sock_is_held() for TCP_TIME_WAIT.