net: adjust handle_macvlan to pass port struct to hook

Now there's null check here and also again in the hook. Looking at bridge bits
which are simmilar, port structure is rcu_dereferenced right away in
handle_bridge and passed to hook. Looks nicer.

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/if_macvlan.h b/include/linux/if_macvlan.h
index b78a712..9ea047a 100644
--- a/include/linux/if_macvlan.h
+++ b/include/linux/if_macvlan.h
@@ -85,6 +85,7 @@
 				      struct net_device *dev);
 
 
-extern struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *);
+extern struct sk_buff *(*macvlan_handle_frame_hook)(struct macvlan_port *,
+						    struct sk_buff *);
 
 #endif /* _LINUX_IF_MACVLAN_H */