[TCP]: Need to declare 'tcp_reno' in net/tcp.h

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/tcp.h

@@ -1169,6 +1169,7 @@ extern u32 tcp_reno_ssthresh(struct tcp_sock *tp);
 extern void tcp_reno_cong_avoid(struct tcp_sock *tp, u32 ack,
 				u32 rtt, u32 in_flight, int flag);
 extern u32 tcp_reno_min_cwnd(struct tcp_sock *tp);
+extern struct tcp_congestion_ops tcp_reno;
 
 static inline void tcp_set_ca_state(struct tcp_sock *tp, u8 ca_state)
 {