Merge branch 'drm-fixes-4.0' of git://people.freedesktop.org/~agd5f/linux into drm-fixes

Just two small fixes for radeon, both destined for stable.

* 'drm-fixes-4.0' of git://people.freedesktop.org/~agd5f/linux:
  drm/radeon: fix wait in radeon_mn_invalidate_range_start
  drm/radeon: add extra check in radeon_ttm_tt_unpin_userptr