[bug report] drm/amd/powerplay: implement smu7 hwmgr to manager asics with smu ip version 7.

[Dan Carpenter]

Hello Rex Zhu,

This is a semi-automatic email about new static checker warnings.

The patch 599a7e9fe1b6: "drm/amd/powerplay: implement smu7 hwmgr to 
manager asics with smu ip version 7." from Sep 9, 2016, leads to the 
following Smatch complaint:

drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/smu7_hwmgr.c:1463 smu7_get_evv_voltages()
	 error: we previously assumed 'table_info' could be null (see line 1455)

drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/smu7_hwmgr.c
  1454	
  1455		if (table_info != NULL)
                     ^^^^^^^^^^^^^^^^^
Check for non-NULL.

  1456			sclk_table = table_info->vdd_dep_on_sclk;
  1457	
  1458		for (i = 0; i < SMU7_MAX_LEAKAGE_COUNT; i++) {
  1459			vv_id = ATOM_VIRTUAL_VOLTAGE_ID0 + i;
  1460	
  1461			if (data->vdd_gfx_control == SMU7_VOLTAGE_CONTROL_BY_SVID2) {
  1462				if (0 == phm_get_sclk_for_voltage_evv(hwmgr,
  1463							table_info->vddgfx_lookup_table, vv_id, &sclk)) {
                                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Unchecked dereference.

  1464					if (phm_cap_enabled(hwmgr->platform_descriptor.platformCaps,
  1465								PHM_PlatformCaps_ClockStretcher)) {

regards,
dan carpenter