Merge branch 'drm-fixes-4.5' of git://people.freedesktop.org/~agd5f/linux into drm-fixes

Just two small fixes in the ttm_tt_populate error handling; one for radeon,
one for amdgpu.

* 'drm-fixes-4.5' of git://people.freedesktop.org/~agd5f/linux:
  drm/radeon: use post-decrement in error handling
  drm/amdgpu: use post-decrement in error handling