ASoC: amd: acp3x: Fix return value check in acp3x_dai_probe()

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

Fixes: c9fe7db6 ("ASoC: amd: Refactoring of DAI from DMA driver")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Link: https://lore.kernel.org/r/20200108035954.51317-1-weiyongjun1@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/raven/acp3x-i2s.c

@@ -321,8 +321,8 @@ static int acp3x_dai_probe(struct platform_device *pdev)
 	}
 	adata->acp3x_base = devm_ioremap(&pdev->dev, res->start,
 						resource_size(res));
-	if (IS_ERR(adata->acp3x_base))
-		return PTR_ERR(adata->acp3x_base);
+	if (!adata->acp3x_base)
+		return -ENOMEM;
 
 	adata->i2s_irq = res->start;
 	dev_set_drvdata(&pdev->dev, adata);