[TCP]: Earlier SACK block verification & simplify access to them

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 34acee6..794497c 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -330,7 +330,7 @@
 	struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */
 	struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/
 
-	struct tcp_sack_block_wire recv_sack_cache[4];
+	struct tcp_sack_block recv_sack_cache[4];
 
 	struct sk_buff *highest_sack;   /* highest skb with SACK received
 					 * (validity guaranteed only if