drm/radeon/dpm/ni: properly catch errors in dpm setup
drm/radeon/dpm/ni: properly catch errors in dpm setup

We weren't properly catching errors in dpm_enable()
and dpm_set_power_state().

Signed-off-by: Alex Deucher <08dc22c6156113f2deff178e35e3ed9b24d6af9e@amd.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs