\brief Update the return value based on Varnode trials, but don't store the data-type If the output parameter is locked, don't do anything. Otherwise, given a list of (at most 1) Varnode, create a return value, grabbing size information from the Varnode. An undefined data-type is created from the given TypeFactory. Any old return value is removed. \param triallist is the list of Varnodes \param f