[U-Boot] [U-Boot, v3, 7/7] efi_loader: Do not leak memory when unlinking a mapping

[Alexander Graf]

> As soon as a mapping is unlinked from the list, there are no further
> references to it, so it should be freed. If it not unlinked,
> update the start address and length.
> 
> Signed-off-by: Stefan Brüns <stefan.bruens at rwth-aachen.de>
> Reviewed-by: Alexander Graf <agraf at suse.de>

Thanks, applied to