sctp: Fix problems with the new SCTP_DELAYED_ACK code

The default sack frequency should be 2.  Also fix copy/paste
error when updating all transports.
Signed-off-by: NVlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/sctp/socket.c

@@ -2471,7 +2471,7 @@ static int sctp_setsockopt_delayed_ack(struct sock *sk,
 					(trans->param_flags & ~SPP_SACKDELAY) |
 					SPP_SACKDELAY_ENABLE;
 			}
-			if (params.sack_delay == 1) {
+			if (params.sack_freq == 1) {
 				trans->param_flags =
 					(trans->param_flags & ~SPP_SACKDELAY) |
 					SPP_SACKDELAY_DISABLE;
@@ -3536,7 +3536,7 @@ SCTP_STATIC int sctp_init_sock(struct sock *sk)
 	sp->pathmaxrxt  = sctp_max_retrans_path;
 	sp->pathmtu     = 0; // allow default discovery
 	sp->sackdelay   = sctp_sack_timeout;
-	sp->sackfreq	= 3;
+	sp->sackfreq	= 2;
 	sp->param_flags = SPP_HB_ENABLE |
 			  SPP_PMTUD_ENABLE |
 			  SPP_SACKDELAY_ENABLE;