fix pitm size computation
fix pitm size computation

gpac/gpac,rbouqueau/gpac_brew_travis,epam/gpac,rauf/gpac,DmitrySigaev/gpac,aymanelyaagoubi/gpac,gpac/gpac,vladimir-kazakov/gpac,gpac/gpac,psteinb/gpac,DmitrySigaev/gpac,rbouqueau/gpac_brew_travis,vladimir-kazakov/gpac,emmanouil/gpac,porcelijn/gpac,gpac/gpac,epam/gpac,vladimir-kazakov/gpac,rauf/gpac,gpac/gpac,aymanelyaagoubi/gpac,aymanelyaagoubi/gpac,psteinb/gpac,Bevara/Access-open,nguyen-viet-thanh-trung/gpac,DmitrySigaev/gpac,epam/gpac,rauf/gpac,DmitrySigaev/gpac,rbouqueau/gpac_brew_travis,porcelijn/gpac,emmanouil/gpac,rbouqueau/gpac_brew_travis,rbouqueau/gpac,aymanelyaagoubi/gpac,rauf/gpac,Bevara/Access-open,rbouqueau/gpac_brew_travis,ARSekkat/gpac,RodolpheFouquet/gpac,RodolpheFouquet/gpac,DmitrySigaev/gpac,epam/gpac,rbouqueau/gpac,RodolpheFouquet/gpac,gpac/gpac,RodolpheFouquet/gpac,aymanelyaagoubi/gpac,ARSekkat/gpac,nguyen-viet-thanh-trung/gpac,RodolpheFouquet/gpac,Bevara/Access-open,psteinb/gpac,nguyen-viet-thanh-trung/gpac,nguyen-viet-thanh-trung/gpac,Bevara/Access-open,vladimir-kazakov/gpac,psteinb/gpac,Bevara/Access-open,porcelijn/gpac,ARSekkat/gpac,rbouqueau/gpac,gpac/gpac,nguyen-viet-thanh-trung/gpac,rauf/gpac,rbouqueau/gpac,DmitrySigaev/gpac,nguyen-viet-thanh-trung/gpac,emmanouil/gpac,ARSekkat/gpac,ARSekkat/gpac,rbouqueau/gpac,rbouqueau/gpac,vladimir-kazakov/gpac,emmanouil/gpac,epam/gpac,psteinb/gpac,psteinb/gpac,emmanouil/gpac,rbouqueau/gpac,rbouqueau/gpac_brew_travis,rbouqueau/gpac,vladimir-kazakov/gpac,RodolpheFouquet/gpac,Bevara/Access-open,rauf/gpac,epam/gpac,porcelijn/gpac,gpac/gpac,aymanelyaagoubi/gpac,ARSekkat/gpac,porcelijn/gpac,porcelijn/gpac,emmanouil/gpac