Correction de warnings

Co-authored-by: touti <bitbucket@io0oi.net>
Reviewed-on: https://git.spip.net/spip-contrib-extensions/optionsproduits/pulls/3


Co-authored-by: touti <touti@noreply.git.spip.net>
Co-committed-by: touti <touti@noreply.git.spip.net>