fix cpp ws client not exit when finished problem (#628)

zhaomingwork

2023-06-14 dde24214fecb1178f5c130f09ad162a1e5847877

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beam_size: 10
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 1.0
lm_weight: 0.7