[riot-notifications] [RIOT] drivers/cc2420: initial netdev port for cc2420 (#3915)

[Hauke Petersen]

> +        return 0;
> +    }
> +    cc2420_tx_prepare(dev);
> +    cc2420_tx_load(dev, data, len);
> +    cc2420_tx_exec(dev);
> +    return len;
> +}
> +
> +void cc2420_tx_prepare(cc2420_t *dev)
> +{
> +    /* make sure ongoing transmissions are finished */
> +    while (cc2420_get_state(dev) & CC2420_STATE_TX_BUSY);
> +
> +    cc2420_strobe(dev, CC2420_STROBE_FLUSHTX);
> +
> +    cc2420_set_state(dev, CC2420_STATE_TX_PREP);

you can drop this - it does nothing.

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https://github.com/RIOT-OS/RIOT/pull/3915/files#r40180181
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