Staging: octeon: Add missing of_node_put after calling of_parse_phandle.

of_node_put needs to be called when the device node which is got
from of_parse_phandle is no longer used.
This patch is found by below coccinelle script:

@@
expression e,e1,e2;
@@
*e = of_parse_phandle(...)
... when != of_node_put(e)
    when != true e == NULL
    when != e2 = e
e = e1
Signed-off-by: Sandhya Bankar <bankarsandhya512@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/octeon/ethernet-mdio.c

@@ -168,6 +168,7 @@ int cvm_oct_phy_setup_device(struct net_device *dev)
 
 	phydev = of_phy_connect(dev, phy_node, cvm_oct_adjust_link, 0,
 				PHY_INTERFACE_MODE_GMII);
+	of_node_put(phy_node);
 
 	if (!phydev)
 		return -ENODEV;