[U-Boot] image: fix support for Android boot images with no ramdisk

[Tom Rini]

On Mon, Oct 05, 2015 at 02:37:07PM -0500, Rob Herring wrote:

> If an Android boot image does not contain a ramdisk, make sure rd_len
> and rd_data are returned to indicate no ramdisk rather than just relying
> on returning an error.
> 
> Signed-off-by: Rob Herring <robh at kernel.org>

Applied to u-boot/master, thanks!

-- 
Tom
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