mediatek-drm fixes
- remove an invalid, unreachable error message and NULL pointer dereference
- remove a spurious drm_connector_unregister call from the DSI driver
* tag 'mediatek-drm-fixes-2016-06-01' of git://git.pengutronix.de/git/pza/linux:
drm/mediatek: mtk_dsi: Remove spurious drm_connector_unregister
drm/mediatek: mtk_dpi: remove invalid error message