drm/i915: Unify error handling for missing DDI buf trans tables
Handle missing buf trans tables, or out of bounds buf trans levels the same way everywhere. These should never be hit under normal conditions, but let's play it safe for now. v2: Avoid the hdmi_level=-1 case (James) Cc: James Ausmus <james.ausmus@intel.com> Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171018181934.4229-1-ville.syrjala@linux.intel.comReviewed-by: NJames Ausmus <james.ausmus@intel.com>
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