gpio: ixp4xx: remove redundant dev_err message

devm_ioremap_resource already contains error message, so remove
the redundant dev_err message

Signed-off-by: Ding Xiang <dingxiang@cmss.chinamobile.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

drivers/gpio/gpio-ixp4xx.c

@@ -321,10 +321,8 @@ static int ixp4xx_gpio_probe(struct platform_device *pdev)
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	g->base = devm_ioremap_resource(dev, res);
-	if (IS_ERR(g->base)) {
-		dev_err(dev, "ioremap error\n");
+	if (IS_ERR(g->base))
 		return PTR_ERR(g->base);
-	}
 
 	/*
 	 * Make sure GPIO 14 and 15 are NOT used as clocks but GPIO on