tcp: do not set snd_ssthresh in tcp_create_openreq_child()

New sockets get the field set to TCP_INFINITE_SSTHRESH in tcp_init_sock()
In case a socket had this field changed and transitions to TCP_LISTEN
state, tcp_disconnect() also makes sure snd_ssthresh is set to
TCP_INFINITE_SSTHRESH.

So a listener has this field set to TCP_INFINITE_SSTHRESH already.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/tcp_minisocks.c

@@ -488,7 +488,6 @@ struct sock *tcp_create_openreq_child(const struct sock *sk,
 	newtp->packets_out = 0;
 	newtp->retrans_out = 0;
 	newtp->sacked_out = 0;
-	newtp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
 	newtp->tlp_high_seq = 0;
 	newtp->lsndtime = tcp_jiffies32;
 	newsk->sk_txhash = treq->txhash;