[PATCH] ARM: mvebu: clearfog: don't override set fdtfile env

[Andre Heider]

On 09/09/2020 14:14, Baruch Siach wrote:
> Only set the fdtfile environment variable when not already set.
> 
> Fixes: 867572f09ebe6 ("ARM: mvebu: clearfog: run-time selection of DT file")
> Cc: Joel Johnson <mrjoel at lixil.net>
> Reported-by: Andre Heider <a.heider at gmail.com>
> Signed-off-by: Baruch Siach <baruch at tkos.co.il>

Reviewed-by: Andre Heider <a.heider at gmail.com>