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Add a helper to get a pointer to struct displayid_header. To be pedantic, add buffer overflow checks to not touch the base if that itself would overflow. Cc: Iaroslav Boliukin <iam@lach.pw> Cc: Dmitry Osipenko <dmitry.osipenko@collabora.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com> Reviewed-by: Dmitry Osipenko <dmitry.osipenko@collabora.com> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com> Link: https://patchwork.freedesktop.org/patch/msgid/4a03b3a5132642d3cdb6d4c2641422955a917292.1676580180.git.jani.nikula@intel.com