packetizer: h264: fix sps/pps chaining with AU prefix
packetizer: h264: fix sps/pps chaining with AU prefix

regression introduced by 1d9cfa88e4505b442c8e4d361e9d83a45e37a7a4

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc