nvdimm: Fix memleak of pmu attr_groups in unregister_nvdimm_pmu()

Memory pointed by 'nd_pmu->pmu.attr_groups' is allocated in function
'register_nvdimm_pmu' and is lost after 'kfree(nd_pmu)' call in function
'unregister_nvdimm_pmu'.

Fixes: 0fab1ba ("drivers/nvdimm: Add perf interface to expose nvdimm performance stats")
Co-developed-by: Ivanov Mikhail <[email protected]>
Signed-off-by: Konstantin Meskhidze <[email protected]>
Reviewed-by: Jeff Moyer <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dave Jiang <[email protected]>

Author: BoardzMaster

drivers/nvdimm/nd_perf.c

@@ -324,6 +324,7 @@ void unregister_nvdimm_pmu(struct nvdimm_pmu *nd_pmu)
 {
 	perf_pmu_unregister(&nd_pmu->pmu);
 	nvdimm_pmu_free_hotplug_memory(nd_pmu);
+	kfree(nd_pmu->pmu.attr_groups);
 	kfree(nd_pmu);
 }
 EXPORT_SYMBOL_GPL(unregister_nvdimm_pmu);