drivers/net/phy/mdio_bus.c: call put_device on device_register() failure

It is required to call put_device() if device_register() fails, so that
we give up the last reference to the device. Calling put_device allows
for mdiobus_release to be executed, kfreeing the bus.

Signed-off-by: Levente Kurusa <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
Cc: Grant Likely <[e-mail]>
Cc: David Daney <[e-mail]>
Cc: David S. Miller <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/net/phy/mdio_bus.c

···
 	err = device_register(&bus->dev);
 	if (err) {
 		pr_err("mii_bus %s failed to register\n", bus->id);
+		put_device(&bus->dev);
 		return -EINVAL;
 	}