[INET]: congestion and af_ops can be const

The congestion ops and af_ops in the inet_connection_sock
can be const.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/inet_connection_sock.h

@@ -83,8 +83,8 @@ struct inet_connection_sock {
  	struct timer_list	  icsk_delack_timer;
 	__u32			  icsk_rto;
 	__u32			  icsk_pmtu_cookie;
-	struct tcp_congestion_ops *icsk_ca_ops;
-	struct inet_connection_sock_af_ops *icsk_af_ops;
+	const struct tcp_congestion_ops *icsk_ca_ops;
+	const struct inet_connection_sock_af_ops *icsk_af_ops;
 	unsigned int		  (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
 	__u8			  icsk_ca_state;
 	__u8			  icsk_retransmits;