drivers: net: phy: xgene: Fix 'remove' function

If 'IS_ERR(pdata->clk)' is true, then 'clk_disable_unprepare(pdata->clk)'
will do nothing.

It is likely that 'if (!IS_ERR(pdata->clk))' was expected here.
In fact, the test can even be removed because 'clk_disable_unprepare'
already handles such cases.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/mdio-xgene.c

@@ -424,10 +424,8 @@ static int xgene_mdio_remove(struct platform_device *pdev)
 	mdiobus_unregister(mdio_bus);
 	mdiobus_free(mdio_bus);
 
-	if (dev->of_node) {
-		if (IS_ERR(pdata->clk))
-			clk_disable_unprepare(pdata->clk);
-	}
+	if (dev->of_node)
+		clk_disable_unprepare(pdata->clk);
 
 	return 0;
 }