driver core: use IS_ERR_OR_NULL() helper in device_create_groups_vargs()

Use IS_ERR_OR_NULL() helper in device_create_groups_vargs() to simplify code
and improve readiblity. No functional change.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20220914140753.3799982-1-yangyingliang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/core.c

@@ -4170,7 +4170,7 @@ device_create_groups_vargs(struct class *class, struct device *parent,
 	struct device *dev = NULL;
 	int retval = -ENODEV;
 
-	if (class == NULL || IS_ERR(class))
+	if (IS_ERR_OR_NULL(class))
 		goto error;
 
 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);