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jack: guard again append without an event in the buffer
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@ -1569,6 +1569,8 @@ static inline int midi_event_append(void *port_buffer, const jack_midi_data_t *d
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size_t old_size;
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uint8_t *old, *buf;
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if (mb->event_count == 0)
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return -ENOBUFS;
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ev = &events[--mb->event_count];
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mb->write_pos -= ev->size;
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old_size = ev->size;
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