drm_hwcomposer: Allow NULL crtcs in display composition

In cases where we have displays which do not have a mode,
the crtc will be NULL. This shouldn't fail the composition
initialization.

Change-Id: I1a6acb72cd3f614b5a7c854ba61be1539efa4bea
Signed-off-by: Sean Paul <seanpaul@chromium.org>
2 files changed