* Return 0 on success else a negative LTTng error code.
*
* Important error codes:
- * LTTNG_ERR_CLEAR_DISALLOWED_RELAY
+ * LTTNG_ERR_CLEAR_RELAY_DISALLOW
* LTTNG_ERR_CLEAR_NOT_AVAILABLE
* LTTNG_ERR_CLEAR_NOT_AVAILABLE_RELAY
* LTTNG_ERR_CLEAR_FAIL_CONSUMER