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Assertion failure in ns_client_endrequest when shutting down

Scenario:

  1. We are shutting down, interface->clientmgr is gone
  2. We receive a packet, it gets through ns__client_request
  3. mgr == NULL, return
  4. isc_nmhandle_detach calls ns_client_reset_cb
  5. ns_client_reset_cb calls ns_client_endrequest
  6. INSIST(client->state == NS_CLIENTSTATE_WORKING || client->state == NS_CLIENTSTATE_RECURSING) is not met - we haven't started processing this packet so client->state == NS_CLIENTSTATE_READY.

Solution - don't call ns_client_endrequest if client->state == NS_CLIENTSTATE_READY

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