drm/i915: Use POSTING_READ() in intel_sdvo_write_sdvox()
Use POSTING_READ() in intel_sdvo_write_sdvox() as appropriate. Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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