Always returning 0 (when `MYNEWT_VAL_BLE_LL_RFMGMT_ENABLE_TIME` is not defined), rather than a time near to the current tick, causes an issue in at least one place: `ble_ll_adv_sm_start()`, where the calculation of `delta` overflows when the system timer is at 0x80000000 or above -- causing an incorrect, huge adjustment to be made to the scheduled time, ultimately stopping adverts from being sent.
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