drm/exynos: two small fixes

[Tobias Jakobi]

Hello,

I've dropped the remaining patches. Going to resend them once Gustavo's
cleanups have landed.

So this leaves just the small fry. Series is still based on [1].

With best wishes,
Tobias

[1] http://www.spinics.net/lists/linux-samsung-soc/msg43103.html

P.S.: I'm not sure if the two remaining patches from [1] still
apply cleanly to exynos-drm-next.