doc: botching-up-ioctls: Make it clearer why structs must be padded
This came up in discussions when reviewing drm patches. Reviewed-by: NEric Anholt <eric@anholt.net> Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com> Signed-off-by: NJonathan Corbet <corbet@lwn.net>
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