fix decoding_ind none bug

haoneng.lhn

2023-09-12 eed5cbb9457f0842d9ea8f41cd88459a5dbc9e70

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add_library(csrc STATIC
        feature-fbank.cc
        feature-functions.cc
        feature-window.cc
        fftsg.c
        mel-computations.cc
        online-feature.cc
        rfft.cc)