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Fix intermittent memory leak in dns_resolver unit

Ondřej Surý requested to merge 3736-fix-intermittent-memory-leak-in-forward-system-test into main

A rdataset could have been left unassociated on the error path in the resume_dslookup() in the dns_resolver unit. Clone the rdataset after the error check, so it's not cloned before we check whether we can make further progress chasing DS records.

Closes #3736 (closed)

Edited by Ondřej Surý

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