tcp: silence registration message

This message isn't really needed it justs waits time/space.

Signed-off-by: Stephen Hemminger <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/ipv4/tcp_cong.c

···
 		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);