eeepc-laptop: fix use after free

eeepc-laptop uses the hwmon struct after unregistering the device, causing
an oops on module unload. Flip the ordering to fix.

Signed-off-by: Matthew Garrett <[e-mail]>
Cc: Henrique de Moraes Holschuh <[e-mail]>
Cc: Corentin Chary <[e-mail]>
Cc: Karol Kozimor <[e-mail]>
Cc: <[e-mail]> [2.6.26.x]
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/misc/eeepc-laptop.c

···
 	hwmon = eeepc_hwmon_device;
 	if (!hwmon)
 		return ;
-	hwmon_device_unregister(hwmon);
 	sysfs_remove_group(&hwmon->kobj,
 			   &hwmon_attribute_group);
+	hwmon_device_unregister(hwmon);
 	eeepc_hwmon_device = NULL;
 }