Is it necessary to repeat the prayer or Surat Al-Fatiha when one forgets to extend "ولا الضالين" (walad-dalleen) in Al-Fatiha?

It was previously explained that shortening the Mad Lazim (obligatory prolongation) after the alif of "wa la ad-dallin" in Surah Al-Fatiha is considered a minor error (lahn) that does not change the meaning. Therefore, there is no need to repeat Al-Fatiha or the prayer. This prolongation is called Mad Lazim or Mad Tawil (long prolongation).