_FindIORequest
status_t error = _FindIORequest(ioRequest, &requestID);
status_t error = _FindIORequest(requestID, &request);
status_t error = _FindIORequest(requestID, &request);
status_t error = _FindIORequest(requestID, &request);
status_t error = _FindIORequest(requestID, &request);
status_t _FindIORequest(io_request* request,
status_t _FindIORequest(int32 requestID,