[TCP] Vegas: Remove extra call to tcp_vegas_rtt_calc

Remove unneeded call to tcp_vegas_rtt_calc. The more accurate
microsecond value has already been registered prior to calling
tcp_vegas_cong_avoid.
Signed-off-by: NThomas Young <tyo@ee.mu.oz.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/tcp_vegas.c

@@ -215,14 +215,6 @@ static void tcp_vegas_cong_avoid(struct sock *sk, u32 ack,
 		vegas->beg_snd_nxt  = tp->snd_nxt;
 		vegas->beg_snd_cwnd = tp->snd_cwnd;
 
-		/* Take into account the current RTT sample too, to
-		 * decrease the impact of delayed acks. This double counts
-		 * this sample since we count it for the next window as well,
-		 * but that's not too awful, since we're taking the min,
-		 * rather than averaging.
-		 */
-		tcp_vegas_rtt_calc(sk, seq_rtt * 1000);
-
 		/* We do the Vegas calculations only if we got enough RTT
 		 * samples that we can be reasonably sure that we got
 		 * at least one RTT sample that wasn't from a delayed ACK.