Fix a few issues found during fine-tuning (#2582)

ming030890

2025-07-04 a750595594321833b48dc19798eed66876a100b4

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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
 
int fstconcat_main(int argc, char **argv);
 
int main(int argc, char **argv) { return fstconcat_main(argc, argv); }