drm/amd/powerplay: fix missed hwmgr check warning before call gfx_off_control handler

drm/amd/powerplay: fix missed hwmgr check warning before call gfx_off_control handler

Patch 9667849bbb8d: "drm/amd/powerplay: add control gfxoff enabling in late
init" from Mar 13, 2018, leads to the following static checker warning:

	drivers/gpu/drm/amd/amdgpu/../powerplay/amd_powerplay.c:194
pp_late_init()
	error: we previously assumed 'hwmgr' could be null (see line 185)

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

This patch fixes the warning to add hwmgr checking.

Reported-by: Dan Carpenter <[email protected]>
Signed-off-by: Huang Rui <[email protected]>
Reviewed-by: Evan Quan <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>