fix: msg_stamp.size() is unsigned,should convert to int (#2523)

TouchZZZ

2025-05-22 eccf74684743593950ad259877db7ce9ffc06e93

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export FUNASR_RUNTIME_ROOT=`pwd`/../
export PATH=$FUNASR_RUNTIME_ROOT/onnxruntime/build/bin:$PWD:$PATH
export LC_ALL=C