chore: Fix leak in PrefixAndTail. #32625
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Note: When upstream finished but downstream is not polling, then the builder is leaked, was reported in pekko.
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Motivation:
When the downstream is not polling it will leak the builder, it was reported in pekko project.
refs: apache/pekko#1623
Modification:
Set the builder to
nullbefore submitting toemit.Result:
Fix leak.