Merge tag 'drm-vc4-next-2015-12-21' of http://github.com/anholt/linux into drm-next

I've decided to just send this fixes-for-next pull request now, even if
we don't have a patch for the CONFIG_PM_SLEEP build failure reviewed.
If you like my patch for that, I'd be happy to see it applied directly.

This pull request brings in little fixes from Dan Carpenter for the 3D
support added in this -next cycle.

* tag 'drm-vc4-next-2015-12-21' of http://github.com/anholt/linux:
  drm/vc4: fix an error code
  drm/vc4: allocate enough memory in vc4_save_hang_state()
  drm/vc4: copy_to_user() returns the number of bytes remaining