Does one interrupt the prostration of forgetfulness if one thought they made a mistake in prayer, then remembered during the prostration that they had not made a mistake?

If one prostrates for forgetfulness (sujud al-sahw) then becomes certain during the prostration that sujud al-sahw is not required of him, he must discontinue the prostration and perform two other prostrations, because he added to his prayer something that is not part of it.