At the destruction of the tcpcb, no timers are supposed to
be running. However, it turns out that stopping them in the
close() / shutdown() call does not have the desired effect
under all circumstances.
This partially reverts 62d47d73b7eb to reduce the nuisance
caused.
Reported-by: syzbot+9a9aa434a14a2b35c3ba@syzkaller.appspotmail.com
Reported-by: syzbot+e82856782410e895bae7@syzkaller.appspotmail.com
PR: 277009