mmc: sdhci-of-arasan: Use signed formatting in error messages

"ret" is a signed int, so use "%d" in format strings instead of "%u".
This prevents cryptic codes in error messages like this:
sdhci-arasan e0101000.sdhci: platform register failed (4294966779)
Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Reviewed-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci-of-arasan.c

@@ -165,7 +165,7 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
 	host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata, 0);
 	if (IS_ERR(host)) {
 		ret = PTR_ERR(host);
-		dev_err(&pdev->dev, "platform init failed (%u)\n", ret);
+		dev_err(&pdev->dev, "platform init failed (%d)\n", ret);
 		goto clk_disable_all;
 	}
 
@@ -176,7 +176,7 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
 
 	ret = sdhci_add_host(host);
 	if (ret) {
-		dev_err(&pdev->dev, "platform register failed (%u)\n", ret);
+		dev_err(&pdev->dev, "platform register failed (%d)\n", ret);
 		goto err_pltfm_free;
 	}