drm/amdkfd: Avoid null pointer in SMI event

Power Management IP is initialized/enabled before KFD init. When a
thermal throttling happens before kfd_smi_init is done, calling the KFD
SMI update function causes a stack dump by referring a NULL pointer (
smi_clients list). Check if kfd_init is completed before calling the
function.
Signed-off-by: Amber Lin <Amber.Lin@amd.com>
Reviewed-by: Mukul Joshi <mukul.joshi@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_device.c

@@ -1322,7 +1322,7 @@ void kfd_dec_compute_active(struct kfd_dev *kfd)
 
 void kgd2kfd_smi_event_throttle(struct kfd_dev *kfd, uint32_t throttle_bitmask)
 {
-	if (kfd)
+	if (kfd && kfd->init_complete)
 		kfd_smi_event_update_thermal_throttling(kfd, throttle_bitmask);
 }