pinctrl: berlin: fix an error code in berlin_pinctrl_probe()

We are returning success here because PTR_ERR(NULL) is zero.  We should
be returning -ENODEV.

Fixes: 3de68d33 ('pinctrl: berlin: add the core pinctrl driver for Marvell Berlin SoCs')
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Acked-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/berlin/berlin.c

@@ -320,7 +320,7 @@ int berlin_pinctrl_probe(struct platform_device *pdev,
 
 	regmap = dev_get_regmap(&pdev->dev, NULL);
 	if (!regmap)
-		return PTR_ERR(regmap);
+		return -ENODEV;
 
 	pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL);
 	if (!pctrl)