drm/crtc_helper: avoid NULL-pointer dereference when encoder is NULL
Signed-off-by: Maarten Maathuis <madman2003@gmail.com> Signed-off-by: Dave Airlie <airlied@linux.ie>
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Signed-off-by: Maarten Maathuis <madman2003@gmail.com> Signed-off-by: Dave Airlie <airlied@linux.ie>