tcp_input.c: Really make sure rto = 3*rtt, found by Pasi Sarolahti

net/ipv4/tcp_input.c

@@ -466,7 +466,7 @@ static __inline__ void tcp_rtt_estimator(struct tcp_opt *tp, __u32 mrtt)
 	} else {
 		/* no previous measure. */
 		tp->srtt = m<<3;	/* take the measured time to be rtt */
-		tp->mdev = m<<2;	/* make sure rto = 3*rtt */
+		tp->mdev = m<<1;	/* make sure rto = 3*rtt */
 		tp->mdev_max = tp->rttvar = max(tp->mdev, TCP_RTO_MIN);
 		tp->rtt_seq = tp->snd_nxt;
 	}