ASoC: amd: fix an IS_ERR() vs NULL bug in probe

The devm_ioremap() function returns NULL on error, it doesn't return
error pointers.

Fixes: e550339e ("ASoC: amd: add vangogh i2s controller driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20210727081756.GA19121@kiliSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/vangogh/acp5x-i2s.c

@@ -399,8 +399,8 @@ static int acp5x_dai_probe(struct platform_device *pdev)
 	}
 	adata->acp5x_base = devm_ioremap(&pdev->dev, res->start,
 					 resource_size(res));
-	if (IS_ERR(adata->acp5x_base))
-		return PTR_ERR(adata->acp5x_base);
+	if (!adata->acp5x_base)
+		return -ENOMEM;
 
 	adata->master_mode = I2S_MASTER_MODE_ENABLE;
 	dev_set_drvdata(&pdev->dev, adata);