[TCP]: Kill westwood bw_sample, set but never used.

include/linux/tcp.h

@@ -377,7 +377,6 @@ struct tcp_opt {
 
 /* TCP Westwood structure */
         struct {
-                __u32    bw_sample;        /* bandwidth sample */
                 __u32    bw_ns_est;        /* first bandwidth estimation..not too smoothed 8) */
                 __u32    bw_est;           /* bandwidth estimate */
                 __u32    rtt_win_sx;       /* here starts a new evaluation... */

net/ipv4/tcp_input.c

@@ -2065,7 +2065,6 @@ static void init_westwood(struct sock *sk)
 {
         struct tcp_opt *tp = tcp_sk(sk);
 
-        tp->westwood.bw_sample = 0;
         tp->westwood.bw_ns_est = 0;
         tp->westwood.bw_est = 0;
         tp->westwood.accounted = 0;
@@ -2088,14 +2087,13 @@ static inline __u32 westwood_do_filter(__u32 a, __u32 b)
 static void westwood_filter(struct sock *sk, __u32 delta)
 {
 	struct tcp_opt *tp = tcp_sk(sk);
-	__u32 sample = tp->westwood.bk / delta;
 
 	tp->westwood.bw_ns_est =
-		westwood_do_filter(tp->westwood.bw_ns_est, sample);
+		westwood_do_filter(tp->westwood.bw_ns_est, 
+				   tp->westwood.bk / delta);
 	tp->westwood.bw_est =
 		westwood_do_filter(tp->westwood.bw_est,
 				   tp->westwood.bw_ns_est);
-	tp->westwood.bw_sample = sample;
 }
 
 /* @westwood_update_rttmin