sctp: remove unnecessary byteshifting, calculate directly in big-endian

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/input.c b/net/sctp/input.c
index 5ed93c0..a49fa80 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -83,8 +83,8 @@
 {
 	struct sk_buff *list = skb_shinfo(skb)->frag_list;
 	struct sctphdr *sh = sctp_hdr(skb);
-	__u32 cmp = ntohl(sh->checksum);
-	__u32 val = sctp_start_cksum((__u8 *)sh, skb_headlen(skb));
+	__be32 cmp = sh->checksum;
+	__be32 val = sctp_start_cksum((__u8 *)sh, skb_headlen(skb));
 
 	for (; list; list = list->next)
 		val = sctp_update_cksum((__u8 *)list->data, skb_headlen(list),