vlan: remove useless struct hlist_node declaration from if_vlan.h

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index cb2e6b4..8e68b05 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -14,10 +14,6 @@
 #define _LINUX_IF_VLAN_H_
 
 #ifdef __KERNEL__
-
-/* externally defined structs */
-struct hlist_node;
-
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>