linux-phytec-fsl

drm/dp: Fix typo in comment

Replace an occurrence of "adapater" with "adapter".

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>