misc: keba: Fix sysfs group creation

sysfs_create_group() races with userspace. Use dev_groups instead which
prevents all the problems of sysfs_create_group().

Fixes: a1944676767e ("misc: keba: Add basic KEBA CP500 system FPGA support")
Suggested-by: Greg Kroah-Hartman <[e-mail]>
Signed-off-by: Gerhard Engleder <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/misc/keba/cp500.c

···
 }
 static DEVICE_ATTR_RW(keep_cfg);
 
-static struct attribute *attrs[] = {
+static struct attribute *cp500_attrs[] = {
 	&dev_attr_version.attr,
 	&dev_attr_keep_cfg.attr,
 	NULL
 };
-static const struct attribute_group attrs_group = { .attrs = attrs };
+ATTRIBUTE_GROUPS(cp500);
 
 static void cp500_i2c_release(struct device *dev)
 {
···
 
 	pci_set_drvdata(pci_dev, cp500);
 
-	ret = sysfs_create_group(&pci_dev->dev.kobj, &attrs_group);
-	if (ret != 0)
-		goto out_free_irq;
 
 	ret = cp500_enable(cp500);
 	if (ret != 0)
-		goto out_remove_group;
+		goto out_free_irq;
 
 	cp500_register_auxiliary_devs(cp500);
 
 	return 0;
 
-out_remove_group:
-	sysfs_remove_group(&pci_dev->dev.kobj, &attrs_group);
 out_free_irq:
 	pci_free_irq_vectors(pci_dev);
 out_disable:
···
 	cp500_unregister_auxiliary_devs(cp500);
 
 	cp500_disable(cp500);
-
-	sysfs_remove_group(&pci_dev->dev.kobj, &attrs_group);
 
 	pci_set_drvdata(pci_dev, 0);
 
···
 	.id_table = cp500_ids,
 	.probe = cp500_probe,
 	.remove = cp500_remove,
+	.dev_groups = cp500_groups,
 };
 module_pci_driver(cp500_driver);