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This will allow code to do x->commit = drm_crtc_commit_get(commit),
making it clearer where references are used.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170904104838.23822-5-maarten.lankhorst@linux.intel.com

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>