net: Put flowi_* prefix on AF independent members of struct flowi

I intend to turn struct flowi into a union of AF specific flowi
structs.  There will be a common structure that each variant includes
first, much like struct sock_common.

This is the first step to move in that direction.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 916152d..e35ca40 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1474,14 +1474,16 @@
 	}
 
 	{
-		struct flowi fl = { .oif = arg->bound_dev_if,
-				    .fl4_dst = daddr,
-				    .fl4_src = rt->rt_spec_dst,
-				    .fl4_tos = RT_TOS(ip_hdr(skb)->tos),
-				    .fl_ip_sport = tcp_hdr(skb)->dest,
-				    .fl_ip_dport = tcp_hdr(skb)->source,
-				    .proto = sk->sk_protocol,
-				    .flags = ip_reply_arg_flowi_flags(arg) };
+		struct flowi fl = {
+			.flowi_oif = arg->bound_dev_if,
+			.fl4_dst = daddr,
+			.fl4_src = rt->rt_spec_dst,
+			.fl4_tos = RT_TOS(ip_hdr(skb)->tos),
+			.fl_ip_sport = tcp_hdr(skb)->dest,
+			.fl_ip_dport = tcp_hdr(skb)->source,
+			.flowi_proto = sk->sk_protocol,
+			.flowi_flags = ip_reply_arg_flowi_flags(arg),
+		};
 		security_skb_classify_flow(skb, &fl);
 		rt = ip_route_output_key(sock_net(sk), &fl);
 		if (IS_ERR(rt))