of: mdio: Fall back to mdiobus_register() with NULL device_node

When the device_node specified is NULL, fall back to mdiobus_register().
We have a number of drivers having a similar pattern which is:

if (np)
of_mdiobus_register()
else
mdiobus_register()

so incorporate that behavior within the core of_mdiobus_register()
function. This is also consistent with the stub version that we defined
when CONFIG_OF=n.

Signed-off-by: Florian Fainelli <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/of/of_mdio.c

···
 	bool scanphys = false;
 	int addr, rc;
 
+	if (!np)
+		return mdiobus_register(mdio);
+
 	/* Do not continue if the node is disabled */
 	if (!of_device_is_available(np))
 		return -ENODEV;