sparc/kernel/vio.c: add put_device() after device_find_child()

The vio_remove() function uses device_find_child() but it does not drop
the reference of the retrieved child.
Signed-off-by: NFederico Vaga <federico.vaga@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

arch/sparc/kernel/vio.c

@@ -342,6 +342,7 @@ static void vio_remove(struct mdesc_handle *hp, u64 node)
 		printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
 
 		device_unregister(dev);
+		put_device(dev);
 	}
 }