drm: fixes when i2c encoder slave mode_fixup is null.
Avoid i2c slave encoder drivers to copy/paste code to implement functions that will only return true. Signed-off-by: NCarlos Palminha <palminha@synopsys.com> [danvet: whitespace requested by Jani.] Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1455106118-32145-1-git-send-email-palminha@synopsys.com
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