sh-pfc: Use PTR_ERR_OR_ZERO() to simplify the code

Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR.
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/sh-pfc/pinctrl.c

@@ -814,8 +814,5 @@ int sh_pfc_register_pinctrl(struct sh_pfc *pfc)
 	pmx->pctl_desc.npins = pfc->info->nr_pins;
 
 	pmx->pctl = devm_pinctrl_register(pfc->dev, &pmx->pctl_desc, pmx);
-	if (IS_ERR(pmx->pctl))
-		return PTR_ERR(pmx->pctl);
-
-	return 0;
+	return PTR_ERR_OR_ZERO(pmx->pctl);
 }