ofw: remove redundant calls in ofwbus_attach()

Since commit ecaecbc7d8, calling
ofw_bus_gen_setup_devinfo() is redundant, as the call to
device_set_ivars() now happens inside simplebus_add_device().

Reviewed by:	markj
Approved by:	markj (mentor)
Differential Revision:	https://reviews.freebsd.org/D40271

sys/dev/ofw/ofwbus.c

@@ -102,7 +102,6 @@ static int
 ofwbus_attach(device_t dev)
 {
 	phandle_t node;
-	struct ofw_bus_devinfo obd;
 
 	node = OF_peer(0);
 
@@ -126,12 +125,9 @@ ofwbus_attach(device_t dev)
 	/*
 	 * Now walk the OFW tree and attach top-level devices.
 	 */
-	for (node = OF_child(node); node > 0; node = OF_peer(node)) {
-		if (ofw_bus_gen_setup_devinfo(&obd, node) != 0)
-			continue;
+	for (node = OF_child(node); node > 0; node = OF_peer(node))
 		simplebus_add_device(dev, node, 0, NULL, -1, NULL);
-		ofw_bus_gen_destroy_devinfo(&obd);
-	}
+
 	return (bus_generic_attach(dev));
 }