genetlink: only pass array to genl_register_family_with_ops()

As suggested by David Miller, make genl_register_family_with_ops()
a macro and pass only the array, evaluating ARRAY_SIZE() in the
macro, this is a little safer.

The openvswitch has some indirection, assing ops/n_ops directly in
that code. This might ultimately just assign the pointers in the
family initializations, saving the struct genl_family_and_ops and
code (once mcast groups are handled differently.)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ieee802154/netlink.c b/net/ieee802154/netlink.c
index 3ffcdbb..1a81709 100644
--- a/net/ieee802154/netlink.c
+++ b/net/ieee802154/netlink.c
@@ -129,8 +129,7 @@
 {
 	int rc;
 
-	rc = genl_register_family_with_ops(&nl802154_family, ieee8021154_ops,
-					   ARRAY_SIZE(ieee8021154_ops));
+	rc = genl_register_family_with_ops(&nl802154_family, ieee8021154_ops);
 	if (rc)
 		return rc;