tcp: remove redundant assigment to snd_cwnd

Not sure how this got in here. git blame says the second assignment was
added in 3a9a57f6, but that commit also removed the first assignment.
Signed-off-by: NTheodore Dubois <tblodt@icloud.com>
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/tcp.c

@@ -2614,7 +2614,6 @@ int tcp_disconnect(struct sock *sk, int flags)
 	WRITE_ONCE(tp->write_seq, seq);
 
 	icsk->icsk_backoff = 0;
-	tp->snd_cwnd = 2;
 	icsk->icsk_probes_out = 0;
 	icsk->icsk_rto = TCP_TIMEOUT_INIT;
 	tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;