gpio: samsung: Add terminating entry for exynos_pinctrl_ids

The of_device_id table is supposed to be zero-terminated.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-samsung.c

@@ -3025,6 +3025,7 @@ static __init int samsung_gpiolib_init(void)
 		{ .compatible = "samsung,exynos4210-pinctrl", },
 		{ .compatible = "samsung,exynos4x12-pinctrl", },
 		{ .compatible = "samsung,exynos5440-pinctrl", },
+		{ }
 	};
 	for_each_matching_node(pctrl_np, exynos_pinctrl_ids)
 		if (pctrl_np && of_device_is_available(pctrl_np))