net: Remove code duplication between offload structures

Move the offload callbacks into its own structure.

Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/tcpv6_offload.c

@@ -81,10 +81,12 @@ static int tcp6_gro_complete(struct sk_buff *skb)
 }
 
 static const struct net_offload tcpv6_offload = {
-	.gso_send_check	=	tcp_v6_gso_send_check,
-	.gso_segment	=	tcp_tso_segment,
-	.gro_receive	=	tcp6_gro_receive,
-	.gro_complete	=	tcp6_gro_complete,
+	.callbacks = {
+		.gso_send_check	=	tcp_v6_gso_send_check,
+		.gso_segment	=	tcp_tso_segment,
+		.gro_receive	=	tcp6_gro_receive,
+		.gro_complete	=	tcp6_gro_complete,
+	},
 };
 
 int __init tcpv6_offload_init(void)