drm/amd/powerplay: Fix potential NULL pointer issue

If doesn't enable dpm, the powerplay will not allocate memory for
hw management. So, hw_init_power_state_table function will reference
NULL pointer when resetting.

Signed-off-by: Xiangliang Yu <Xiangliang.Yu@amd.com>
Reviewed-by: Rex Zhu <Rex.Zhu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

drivers/gpu/drm/amd/powerplay/amd_powerplay.c

@@ -1004,12 +1004,12 @@ int amd_powerplay_reset(void *handle)
 	if (ret)
 		return ret;
 
-	hw_init_power_state_table(instance->hwmgr);
-
 	if ((amdgpu_dpm == 0)
 		|| cgs_is_virtualization_enabled(instance->smu_mgr->device))
 		return 0;
 
+	hw_init_power_state_table(instance->hwmgr);
+
 	if (eventmgr == NULL || eventmgr->pp_eventmgr_init == NULL)
 		return -EINVAL;