tcp: silence registration message

This message isn't really needed it justs waits time/space.
Signed-off-by: NStephen Hemminger <stephen@networkplumber.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/tcp_cong.c

@@ -83,7 +83,7 @@ int tcp_register_congestion_control(struct tcp_congestion_ops *ca)
 		ret = -EEXIST;
 	} else {
 		list_add_tail_rcu(&ca->list, &tcp_cong_list);
-		pr_info("%s registered\n", ca->name);
+		pr_debug("%s registered\n", ca->name);
 	}
 	spin_unlock(&tcp_cong_list_lock);