drm: fixes crct set_mode when encoder mode_fixup is null.
Avoids null crash when encoders don't implement mode_fixup. Signed-off-by: NCarlos Palminha <palminha@synopsys.com> [danvet: Also update kerneldoc.] Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1455106522-32307-1-git-send-email-palminha@synopsys.com
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