platform/x86: think-lmi: Fix class device unregistration

[ Upstream commit 5ff1fbb3059730700b4823f43999fc1315984632 ]

Devices under the firmware_attributes_class do not have unique a dev_t.
Therefore, device_unregister() should be used instead of
device_destroy(), since the latter may match any device with a given
dev_t.

Fixes: a40cd7e ("platform/x86: think-lmi: Add WMI interface support on Lenovo platforms")
Signed-off-by: Kurt Borja <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Ilpo Järvinen <[email protected]>
Signed-off-by: Ilpo Järvinen <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: kuu-rt

drivers/platform/x86/think-lmi.c

@@ -1380,7 +1380,7 @@ static int tlmi_sysfs_init(void)
 fail_create_attr:
 	tlmi_release_attr();
 fail_device_created:
-	device_destroy(fw_attr_class, MKDEV(0, 0));
+	device_unregister(tlmi_priv.class_dev);
 fail_class_created:
 	fw_attributes_class_put();
 	return ret;
@@ -1602,7 +1602,7 @@ static int tlmi_analyze(void)
 static void tlmi_remove(struct wmi_device *wdev)
 {
 	tlmi_release_attr();
-	device_destroy(fw_attr_class, MKDEV(0, 0));
+	device_unregister(tlmi_priv.class_dev);
 	fw_attributes_class_put();
 }