coresight: tpda: fix return value check in tpda_probe()

devm_ioremap_resource() never returns NULL pointer, it
will return ERR_PTR() when it fails, so replace the check
with IS_ERR().

Fixes: 5b791662 ("Coresight: Add TPDA link driver")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
[ Fix return value to the PTR_ERR(base) ]
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20230129084246.537694-1-yangyingliang@huawei.com

drivers/hwtracing/coresight/coresight-tpda.c

@@ -145,8 +145,8 @@ static int tpda_probe(struct amba_device *adev, const struct amba_id *id)
 	dev_set_drvdata(dev, drvdata);
 
 	base = devm_ioremap_resource(dev, &adev->res);
-	if (!base)
-		return -ENOMEM;
+	if (IS_ERR(base))
+		return PTR_ERR(base);
 	drvdata->base = base;
 
 	spin_lock_init(&drvdata->spinlock);