crypto: aspeed - fix return value check in aspeed_hace_probe()

In case of error, the function devm_ioremap_resource() returns
ERR_PTR() not NULL. The NULL test in the return value check must be
replaced with IS_ERR().

Fixes: 108713a7 ("crypto: aspeed - Add HACE hash driver")
Signed-off-by: Sun Ke <sunke32@huawei.com>
Reviewed-by: Neal Liu<neal_liu@aspeedtech.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/aspeed/aspeed-hace.c

@@ -123,9 +123,9 @@ static int aspeed_hace_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, hace_dev);
 
 	hace_dev->regs = devm_ioremap_resource(&pdev->dev, res);
-	if (!hace_dev->regs) {
+	if (IS_ERR(hace_dev->regs)) {
 		dev_err(&pdev->dev, "Failed to map resources\n");
-		return -ENOMEM;
+		return PTR_ERR(hace_dev->regs);
 	}
 
 	/* Get irq number and register it */