lwtunnel: remove device arg to lwtunnel_build_state

Nothing about lwt state requires a device reference, so remove the
input argument.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/mpls/mpls_iptunnel.c

@@ -133,7 +133,7 @@ drop:
 	return -EINVAL;
 }
 
-static int mpls_build_state(struct net_device *dev, struct nlattr *nla,
+static int mpls_build_state(struct nlattr *nla,
 			    unsigned int family, const void *cfg,
 			    struct lwtunnel_state **ts)
 {