drm/amd/powerplay: enable dpm for baffin.

[Dan Carpenter]

Hello Rex Zhu,

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

The patch a23eefa2f461: "drm/amd/powerplay: enable dpm for baffin." 
from Nov 19, 2015, leads to the following Smatch complaint:

drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/polaris10_hwmgr.c:206 
phm_apply_dal_min_voltage_request()
         error: we previously assumed 'table' could be null (see line 202)

drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/polaris10_hwmgr.c
   201  
   202          if (!table && !(dal_power_level >= PP_DAL_POWERLEVEL_ULTRALOW &&
                           ^^
Should this be an ||?

   203                          dal_power_level <= 
PP_DAL_POWERLEVEL_PERFORMANCE))
   204                  return;
   205  
   206          for (i = 0; i < table->count; i++) {
                                ^^^^^^^^^^^^
Because if table is ever NULL then we're toasted on the next line.

   207                  if (dal_power_level == table->entries[i].clk) {
   208                          req_vddc = table->entries[i].v;

regards,
dan carpenter