daemon/worker: fix a memory leak
Discovered case: TCP write towards upstream fails due to ECONNRESET, and on this place of code we "forget" the whole qr_task and thus its corresponding kr_request, so it remains unanswered and using memory.
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Discovered case: TCP write towards upstream fails due to ECONNRESET, and on this place of code we "forget" the whole qr_task and thus its corresponding kr_request, so it remains unanswered and using memory.