fixed potential mem leak intoduced by previous commit
fixed potential mem leak intoduced by previous commit

rbouqueau/gpac,RodolpheFouquet/gpac,gpac/gpac,rbouqueau/gpac,gpac/gpac,gpac/gpac,RodolpheFouquet/gpac,gpac/gpac,gpac/gpac,rbouqueau/gpac,rbouqueau/gpac,rbouqueau/gpac,gpac/gpac,RodolpheFouquet/gpac,gpac/gpac,rbouqueau/gpac,rbouqueau/gpac,rbouqueau/gpac,RodolpheFouquet/gpac,RodolpheFouquet/gpac,RodolpheFouquet/gpac,gpac/gpac