drm/amd/powerplay: not free hwmgr/smumgr in asic private functions.

struct smumgr/hwmgr will be freed on amd_powerplay_destory

and if we free them in one of asic private functions, other private
date may not be freed. for example: power state and power table
in hwmgr.
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c

@@ -1217,10 +1217,9 @@ static int cz_hwmgr_backend_init(struct pp_hwmgr *hwmgr)
 
 static int cz_hwmgr_backend_fini(struct pp_hwmgr *hwmgr)
 {
-	if (hwmgr != NULL && hwmgr->backend != NULL) {
+	if (hwmgr != NULL && hwmgr->backend != NULL)
 		kfree(hwmgr->backend);
-		kfree(hwmgr);
-	}
+
 	return 0;
 }
 

drivers/gpu/drm/amd/powerplay/smumgr/cz_smumgr.c

@@ -831,7 +831,6 @@ static int cz_smu_fini(struct pp_smumgr *smumgr)
 		cgs_free_gpu_mem(smumgr->device,
 				cz_smu->smu_buffer.handle);
 		kfree(cz_smu);
-		kfree(smumgr);
 	}
 
 	return 0;