fix vad realtime space bug

mengzhe.cmz

2023-05-08 3d7c0c5d2d1e097ae17dc4275c75050574d1f217

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beam_size: 10
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 0.5
lm_weight: 0.7