CID 452336: Passing freed pointer "csock" as an argument to "isc__nm_accept_connection_log"

Coverity Scan claims the following two issues, likely rooted in #3985 (closed).

/lib/isc/netmgr/tcp.c: 818 in tcpaccept_cb()
812     	isc_nmsocket_t *sock = arg;
813     
814     	REQUIRE(VALID_NMSOCK(sock));
815     	REQUIRE(sock->tid == isc_tid());
816     
817     	isc_result_t result = accept_connection(sock);
>>>     CID 452335:  Memory - illegal accesses  (USE_AFTER_FREE)
>>>     Passing freed pointer "sock" as an argument to "isc__nm_accept_connection_log".
818     	isc__nm_accept_connection_log(sock, result, can_log_tcp_quota());
819     	isc__nmsocket_detach(&sock);
820     }
821     
822     static void
823     quota_accept_cb(void *arg) {

/lib/isc/netmgr/tcp.c: 834 in quota_accept_cb()
828     	/*
829     	 * This needs to be asynchronous, because the quota might have been
830     	 * released by a different child socket.
831     	 */
832     	if (csock->tid == isc_tid()) {
833     		isc_result_t result = accept_connection(csock);
>>>     CID 452336:  Memory - illegal accesses  (USE_AFTER_FREE)
>>>     Passing freed pointer "csock" as an argument to "isc__nm_accept_connection_log".
834     		isc__nm_accept_connection_log(csock, result,
835     					      can_log_tcp_quota());
836     	} else {
837     		isc__nmsocket_attach(csock, &(isc_nmsocket_t *){ NULL });
838     		isc_async_run(csock->worker->loop, tcpaccept_cb, csock);
839     	}