tcp: clear tp->data_segs{in|out} in tcp_disconnect()

tp->data_segs_in and tp->data_segs_out need to be cleared
in tcp_disconnect().

tcp_disconnect() is rarely used, but it is worth fixing it.

Fixes: a44d6ea ("tcp: Add RFC4898 tcpEStatsPerfDataSegsOut/In")
Signed-off-by: Eric Dumazet <[email protected]>
Cc: Martin KaFai Lau <[email protected]>
Cc: Yuchung Cheng <[email protected]>
Cc: Neal Cardwell <[email protected]>
Acked-by: Neal Cardwell <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>

Author: edumazet

net/ipv4/tcp.c

@@ -2643,6 +2643,8 @@ int tcp_disconnect(struct sock *sk, int flags)
 	tp->bytes_acked = 0;
 	tp->bytes_received = 0;
 	tp->bytes_retrans = 0;
+	tp->data_segs_in = 0;
+	tp->data_segs_out = 0;
 	tp->duplicate_sack[0].start_seq = 0;
 	tp->duplicate_sack[0].end_seq = 0;
 	tp->dsack_dups = 0;