drm/i915/lspcon: Get DDC adapter via container_of() instead of cached ptr
We can use the container_of() magic to get to the DDC adapter, so no need for caching a pointer to it. We'll also need to get at the intel_dp ptr in the following patch, so add a helper that can be used for both purposes. Cc: Shashank Sharma <shashank.sharma@intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Jani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1477326811-30431-8-git-send-email-imre.deak@intel.com
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