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: Federico Vaga <federico.vaga@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/vio.c b/arch/sparc/kernel/vio.c
index 3e244f3..8647fcc 100644
--- a/arch/sparc/kernel/vio.c
+++ b/arch/sparc/kernel/vio.c
@@ -342,6 +342,7 @@
 		printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
 
 		device_unregister(dev);
+		put_device(dev);
 	}
 }