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Currently we overwrite ethaddr and eth1addr only if these variables don't exist. Better overwrite them even if the env variable exists, but is invalid - eth_env_get_enetaddr_by_index() checks for validity. Refactor the code to use a for cycle. Signed-off-by: Marek Behún <marek.behun@nic.cz> Reviewed-by: Stefan Roese <sr@denx.de>