net: pxa168_eth: remove redundant null check before clk_disable_unprepare()

Because clk_prepare_enable() and clk_disable_unprepare() already checked
NULL clock parameter, so the additional checks are unnecessary, just
remove them.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/pxa168_eth.c

@@ -1541,10 +1541,8 @@ static int pxa168_eth_remove(struct platform_device *pdev)
 	}
 	if (dev->phydev)
 		phy_disconnect(dev->phydev);
-	if (pep->clk) {
-		clk_disable_unprepare(pep->clk);
-	}
 
+	clk_disable_unprepare(pep->clk);
 	mdiobus_unregister(pep->smi_bus);
 	mdiobus_free(pep->smi_bus);
 	unregister_netdev(dev);