net: Remove unused parameter from fill method in fib_rules_ops.

The netlink message header (struct nlmsghdr) is an unused parameter in
fill method of fib_rules_ops struct.  This patch removes this
parameter from this method and fixes the places where this method is
called.

(include/net/fib_rules.h)

Signed-off-by: Rami Rosen <ramirose@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/decnet/dn_rules.c b/net/decnet/dn_rules.c
index a2690b1..72495f2 100644
--- a/net/decnet/dn_rules.c
+++ b/net/decnet/dn_rules.c
@@ -192,7 +192,7 @@
 }
 
 static int dn_fib_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
-			    struct nlmsghdr *nlh, struct fib_rule_hdr *frh)
+			    struct fib_rule_hdr *frh)
 {
 	struct dn_fib_rule *r = (struct dn_fib_rule *)rule;