eth/downloader: exit loop when there is no more available task
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@ -1093,6 +1093,10 @@ func (d *Downloader) fetchParts(errCancel error, deliveryCh chan dataPack, deliv
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throttled = true
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break
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}
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// Short circuit if there is no more available task.
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if pending() == 0 {
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break
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}
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// Reserve a chunk of fetches for a peer. A nil can mean either that
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// no more headers are available, or that the peer is known not to
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// have them.
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