gpio: altera: drop of_match_ptr for ID table

The driver can match only via the DT table so the table should be always
used and the of_match_ptr does not have any sense (this also allows ACPI
matching via PRP0001, even though it might not be relevant here).

  drivers/gpio/gpio-altera.c:324:34: error: ‘altera_gpio_of_match’ defined but not used [-Werror=unused-const-variable=]
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/gpio-altera.c

@@ -335,7 +335,7 @@ MODULE_DEVICE_TABLE(of, altera_gpio_of_match);
 static struct platform_driver altera_gpio_driver = {
 	.driver = {
 		.name	= "altera_gpio",
-		.of_match_table = of_match_ptr(altera_gpio_of_match),
+		.of_match_table = altera_gpio_of_match,
 	},
 	.probe		= altera_gpio_probe,
 	.remove		= altera_gpio_remove,