The size of the ControlValue class is checked by a static_assert() to avoid accidental ABI breakages. There's no need to perform the check every time controls.h is included, move it to controls.cpp. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>