ipv6: Use correct data types for ICMPv6 type and code

Change all the code that deals directly with ICMPv6 type and code
values to use u8 instead of a signed int as that's the actual data
type.

Signed-off-by: Brian Haley <brian.haley@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index 52449f7..86f42a2 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -405,7 +405,7 @@
 }
 
 static void ah6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
-		    int type, int code, int offset, __be32 info)
+		    u8 type, u8 code, int offset, __be32 info)
 {
 	struct net *net = dev_net(skb->dev);
 	struct ipv6hdr *iph = (struct ipv6hdr*)skb->data;