intel_th: Check for NULL instead of ERR_PTR

devm_ioremap() returns NULL on error, it doesn't return an ERR_PTR,
which is what the current code does. This patch corrects these
checks.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hwtracing/intel_th/gth.c

@@ -635,8 +635,8 @@ static int intel_th_gth_probe(struct intel_th_device *thdev)
 		return -ENODEV;
 
 	base = devm_ioremap(dev, res->start, resource_size(res));
-	if (IS_ERR(base))
-		return PTR_ERR(base);
+	if (!base)
+		return -ENOMEM;
 
 	gth = devm_kzalloc(dev, sizeof(*gth), GFP_KERNEL);
 	if (!gth)

drivers/hwtracing/intel_th/msu.c

@@ -1458,8 +1458,8 @@ static int intel_th_msc_probe(struct intel_th_device *thdev)
 		return -ENODEV;
 
 	base = devm_ioremap(dev, res->start, resource_size(res));
-	if (IS_ERR(base))
-		return PTR_ERR(base);
+	if (!base)
+		return -ENOMEM;
 
 	msc = devm_kzalloc(dev, sizeof(*msc), GFP_KERNEL);
 	if (!msc)

drivers/hwtracing/intel_th/pti.c

@@ -207,8 +207,8 @@ static int intel_th_pti_probe(struct intel_th_device *thdev)
 		return -ENODEV;
 
 	base = devm_ioremap(dev, res->start, resource_size(res));
-	if (IS_ERR(base))
-		return PTR_ERR(base);
+	if (!base)
+		return -ENOMEM;
 
 	pti = devm_kzalloc(dev, sizeof(*pti), GFP_KERNEL);
 	if (!pti)

drivers/hwtracing/intel_th/sth.c

@@ -194,16 +194,16 @@ static int intel_th_sth_probe(struct intel_th_device *thdev)
 		return -ENODEV;
 
 	base = devm_ioremap(dev, res->start, resource_size(res));
-	if (IS_ERR(base))
-		return PTR_ERR(base);
+	if (!base)
+		return -ENOMEM;
 
 	res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 1);
 	if (!res)
 		return -ENODEV;
 
 	channels = devm_ioremap(dev, res->start, resource_size(res));
-	if (IS_ERR(channels))
-		return PTR_ERR(channels);
+	if (!channels)
+		return -ENOMEM;
 
 	sth = devm_kzalloc(dev, sizeof(*sth), GFP_KERNEL);
 	if (!sth)