The control_ids.h.in and property_ids.h.in headers use C++-style comments, when the coding style mandates C-style comments. Fix them. While at it, adjust three minor typos in comments. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>