h264: Avoid out-of-bound due to invalid payloadSize within sei_message().
h264: Avoid out-of-bound due to invalid payloadSize within sei_message().

silverfilain/L-SMASH,l-smash/l-smash,l-smash/l-smash,l-smash/l-smash,silverfilain/L-SMASH,silverfilain/L-SMASH