Function sdm_del_channel 

pub unsafe extern "C" fn sdm_del_channel(
    chan: *mut sdm_channel_t,
) -> i32

@brief Delete the Sigma Delta channel

@param[in] chan SDM channel created by sdm_new_channel @return - ESP_OK: Delete the SDM channel successfully - ESP_ERR_INVALID_ARG: Delete the SDM channel failed because of invalid argument - ESP_ERR_INVALID_STATE: Delete the SDM channel failed because the channel is not in init state - ESP_FAIL: Delete the SDM channel failed because of other error