ACPI / hotplug: Make acpi_hotplug_profile_ktype static

The acpi_hotplug_profile_ktype object should be static, so make that
be the case.
Reported-by: NFengguang Wu <fengguang.wu@intel.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/sysfs.c

@@ -750,7 +750,7 @@ static struct attribute *hotplug_profile_attrs[] = {
 	NULL
 };
 
-struct kobj_type acpi_hotplug_profile_ktype = {
+static struct kobj_type acpi_hotplug_profile_ktype = {
 	.sysfs_ops = &kobj_sysfs_ops,
 	.default_attrs = hotplug_profile_attrs,
 };