pinctrl/nomadik: fix null in irqdomain errorpath

The irqdomain conversion failed to notice that we do not always
have a DT node to dereference, fix this up by using a simple
dev_err() that also tells the name of the device.

Cc: Loic Pallardy <loic.pallardy@st.com>
Cc: Patrice Chotard <patrice.chotard@stericsson.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-nomadik.c

@@ -1292,7 +1292,7 @@ static int __devinit nmk_gpio_probe(struct platform_device *dev)
 						NOMADIK_GPIO_TO_IRQ(pdata->first_gpio),
 						0, &nmk_gpio_irq_simple_ops, nmk_chip);
 	if (!nmk_chip->domain) {
-		pr_err("%s: Failed to create irqdomain\n", np->full_name);
+		dev_err(&dev->dev, "failed to create irqdomain\n");
 		ret = -ENOSYS;
 		goto out;
 	}