htcp: merge icsk_ca_state compare

Similar to what is done elsewhere in TCP code when double
state checks are being done.
Signed-off-by: NIlpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/tcp_htcp.c

@@ -115,8 +115,7 @@ static void measure_achieved_throughput(struct sock *sk, u32 pkts_acked, s32 rtt
 		return;
 
 	/* achieved throughput calculations */
-	if (icsk->icsk_ca_state != TCP_CA_Open &&
-	    icsk->icsk_ca_state != TCP_CA_Disorder) {
+	if (!((1 << icsk->icsk_ca_state) & (TCPF_CA_Open | TCPF_CA_Disorder))) {
 		ca->packetcount = 0;
 		ca->lasttime = now;
 		return;