ethereum / go-ethereum / 4798

83%

master: 36%

Pull #1980

travis-ci

eth/downloader: don't hang for spurious deliveries

Unexpected deliveries could block indefinitely if they arrived at the
right time. The quick fix is to ensure that the cancellation channel is
always closed when the sync ends, unblocking any deliveries. Also remove
the atomic check for whether a sync is currently running because it
doesn't help and can be misleading.

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