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

TouchZZZ

2025-05-22 eccf74684743593950ad259877db7ce9ffc06e93

1
2
3
4
5
6
7
8
9
10
ten    10
eleven    11
twelve    12
thirteen    13
fourteen    14
fifteen    15
sixteen    16
seventeen    17
eighteen    18
nineteen    19