fsmn-vad bugfix (#1270)

zhifu gao

2024-01-18 b28f3c9da94ae72a3a0b7bb5982b587be7cf4cd6

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.