Makes the tool return 1 if there is any potential issues. This is needed when using this tool for pre-commit hook in order to abort the commit process. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>