The function stereo_memory_enc has an obsolete argument `tdm_last_ratio` . Via the pointer variable, a variable in the calling function is set, but it is never used, neither inside the function nor outside. The variable could be cleaned out to match with the BASOP code which does not have the argument at all. <!--- Below are labels that will be added but are not shown in description. This is a template to help fill them. Add further information to the first row and remove and add labels as necessary.-->