tcp: Fix a data-race around sysctl_tcp_max_orphans.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2149949


Upstream Status: linux.git

commit 47e6ab24
Author: Kuniyuki Iwashima <kuniyu@amazon.com>
Date:   Wed Jul 6 16:39:58 2022 -0700

    tcp: Fix a data-race around sysctl_tcp_max_orphans.

    While reading sysctl_tcp_max_orphans, it can be changed concurrently.
    So, we need to add READ_ONCE() to avoid a data-race.

    Fixes: 1da177e4 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Guillaume Nault <gnault@redhat.com>