fixed potential crash with l-hevc resize in top/bottom output - cf #1138
fixed potential crash with l-hevc resize in top/bottom output - cf #1138

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