usb: phy: phy-keystone: Simplify return statement

Replace redundant variable use in return statement.

Signed-off-by: Saurabh Karajgaonkar <[e-mail]>
Signed-off-by: Felipe Balbi <[e-mail]>

drivers/usb/phy/phy-keystone.c

···
 
 	platform_set_drvdata(pdev, k_phy);
 
-	ret = usb_add_phy_dev(&k_phy->usb_phy_gen.phy);
-	if (ret)
-		return ret;
-
-	return 0;
+	return usb_add_phy_dev(&k_phy->usb_phy_gen.phy);
 }
 
 static int keystone_usbphy_remove(struct platform_device *pdev)