CVE-2023-52520

In the Linux kernel, the following vulnerability has been resolved:
platform/x86: think-lmi: Fix reference leak If a duplicate attribute is
found using kset_find_obj(), a reference to that attribute is returned
which needs to be disposed accordingly using kobject_put(). Move the
setting name validation into a separate function to allow for this change
without having to duplicate the cleanup code for this setting. As a side
note, a very similar bug was fixed in commit 7295a996fdab (“platform/x86:
dell-sysman: Fix reference leak”), so it seems that the bug was copied from
that driver. Compile-tested only.