pinctrl: bcm: use PTR_ERR_OR_ZERO() to simplify code

Use the standard error pointer macro to shorten the code and simplify.

Signed-off-by: Xichao Zhao <[e-mail]>
Link: https://lore.kernel.org/[e-mail]
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/bcm/pinctrl-bcm6358.c

···
 	pc = platform_get_drvdata(pdev);
 
 	priv->overlays = devm_regmap_field_alloc(dev, pc->regs, overlays);
-	if (IS_ERR(priv->overlays))
-		return PTR_ERR(priv->overlays);
 
-	return 0;
+	return PTR_ERR_OR_ZERO(priv->overlays);
 }
 
 static const struct of_device_id bcm6358_pinctrl_match[] = {