net: Add skb_get_hash_raw

Function to just return skb->rxhash without checking to see if it needs
to be recomputed.

Signed-off-by: Tom Herbert <therbert@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/skbuff.h

@@ -771,6 +771,11 @@ static inline __u32 skb_get_hash(struct sk_buff *skb)
 	return skb->rxhash;
 }
 
+static inline __u32 skb_get_hash_raw(const struct sk_buff *skb)
+{
+	return skb->rxhash;
+}
+
 static inline void skb_clear_hash(struct sk_buff *skb)
 {
 	skb->rxhash = 0;