fix #269 : variable set to NULL after being freed because the logic may need to double-cleanups
fix #269 : variable set to NULL after being freed because the logic may need to double-cleanups

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