[NET]: Annotate checksums in on-the-wire packets.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 0aecfc9..dd61b17 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -52,7 +52,7 @@
 #error	"Adjust your <asm/byteorder.h> defines"
 #endif	
 	__be16	window;
-	__be16	check;
+	__sum16	check;
 	__be16	urg_ptr;
 };