ipv4: Kill early demux method return value.

It's completely unnecessary.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/protocol.h b/include/net/protocol.h
index 967b926c..057f2d3 100644
--- a/include/net/protocol.h
+++ b/include/net/protocol.h
@@ -37,7 +37,7 @@
 
 /* This is used to register protocols. */
 struct net_protocol {
-	int			(*early_demux)(struct sk_buff *skb);
+	void			(*early_demux)(struct sk_buff *skb);
 	int			(*handler)(struct sk_buff *skb);
 	void			(*err_handler)(struct sk_buff *skb, u32 info);
 	int			(*gso_send_check)(struct sk_buff *skb);