Merge tag 'drm-fsl-dcu-for-v4.11' of http://git.agner.ch/git/linux-drm-fsl-dcu into drm-next

two minor fixes.

* tag 'drm-fsl-dcu-for-v4.11' of http://git.agner.ch/git/linux-drm-fsl-dcu:
  drm/fsl-dcu: check for clk_prepare_enable() error
  drm/fsl-dcu: remove unneeded 'ret' assignment