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/mip6.c b/net/ipv6/mip6.c
index f995e19..f797e8c 100644
--- a/net/ipv6/mip6.c
+++ b/net/ipv6/mip6.c
@@ -54,7 +54,7 @@
 	return data + padlen;
 }
 
-static inline void mip6_param_prob(struct sk_buff *skb, int code, int pos)
+static inline void mip6_param_prob(struct sk_buff *skb, u8 code, int pos)
 {
 	icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev);
 }