a5e2a488e8
Previously, the condition in on_stream_io_impl() never hit, as the read packet is always taken from the stream in the few lines above. Instead of the dns_stream_complete() under the condition, the stream is unref()ed in the on_packet callback for LLMNR stream, unlike the other on_packet callbacks. That's quite tricky. Also, potentially, the stream may still have queued packets to write. This fix the condition, and drops the unref() in the on_packet callback. C.f. https://github.com/systemd/systemd/pull/22274#issuecomment-1023708449. Closes #22266.
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