CVE-2023-53697 nvdimm: Fix memleak of pmu attr_groups in unregister_nvdimm_pmu()

In the Linux kernel, the following vulnerability has been resolved: nvdimm: Fix memleak of pmu attrgroups in unregisternvdimmpmu Memory pointed by 'ndpmu-pmu.attrgroups' is allocated in function 'registernvdimmpmu' and is lost after 'kfreendpmu' call in function 'unregisternvdimmpmu'...