[PATCH] drm: fix return value check

[Akinobu Mita <akinobu.mita@gmail.com>]

class_create() and class_device_create() return error code as a
pointer on failure. These return values need to be checked by
IS_ERR().

Cc: David Airlie <airlied@linux.ie>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>

 drivers/char/drm/drm_sysfs.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

Index: work-fault-inject/drivers/char/drm/drm_sysfs.c
===================================================================
--- work-fault-inject.orig/drivers/char/drm/drm_sysfs.c
+++ work-fault-inject/drivers/char/drm/drm_sysfs.c
@@ -45,8 +45,8 @@ struct class *drm_sysfs_create(struct mo
 	int err;
 
 	class = class_create(owner, name);
-	if (!class) {
-		err = -ENOMEM;
+	if (IS_ERR(class)) {
+		err = PTR_ERR(class);
 		goto err_out;
 	}
 
@@ -113,8 +113,8 @@ struct class_device *drm_sysfs_device_ad
 					MKDEV(DRM_MAJOR, head->minor),
 					&(head->dev->pdev)->dev,
 					"card%d", head->minor);
-	if (!class_dev) {
-		err = -ENOMEM;
+	if (IS_ERR(class_dev)) {
+		err = PTR_ERR(class_dev);
 		goto err_out;
 	}