drm/i915: Make intel_dp_check_link_status() static
This function is only used in intel_dp.c since: commit 0e32b39c Author: Dave Airlie <airlied@redhat.com> Date: Fri May 2 14:02:48 2014 +1000 drm/i915: add DP 1.2 MST support (v0.7) Signed-off-by: Damien Lespiau <damien.lespiau@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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