minor cleanup in shared_from_this_wrapper
minor cleanup in shared_from_this_wrapper

syxolk/cereal,fawkes74/cereal,heamon7/cereal,vcatechnology/cereal,guker/cereal,abutcher-gh/cereal,adasworks/cereal,guker/cereal,jonathan-beard/cereal,JosephLaurino/cereal,headupinclouds/cereal,jkhoogland/cereal,stevehickman/cereal,USCiLab/cereal,jkhoogland/cereal,vcatechnology/cereal,lyager/cereal,jonathan-beard/cereal,lyager/cereal,arvidsson/cereal,USCiLab/cereal,arvidsson/cereal,fawkes74/cereal,abutcher-gh/cereal,headupinclouds/cereal,sschaetz/cereal,stevehickman/cereal,RobertoMalatesta/cereal,sschaetz/cereal,RobertoMalatesta/cereal,syxolk/cereal,heamon7/cereal,adasworks/cereal,JosephLaurino/cereal