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[9.20] fix: usr: Fix race condition when canceling ADB find

bind-team-rw-api-rw-repo requested to merge backport-5024-fix-crash-in-dns_adb_cancelfind-9.20 into bind-9.20

When canceling the ADB find, the lock on the find gets released for a brief period of time to be locked again inside adbname lock. During the brief period that the ADB find is unlocked, it can get canceled by other means removing it from the adbname list which in turn causes assertion failure due to a double removal from the adbname list. This has been fixed.

Closes #5024 (closed)

Backport of MR !9722 (merged)

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