[U-Boot] spl_mmc.c: Detect missing kernel image in RAW MMC

[Tom Rini]

On Fri, Jun 28, 2013 at 02:43:01PM -0400, Tom Rini wrote:

> Currently, we assume that if we can read from MMC correctly, we have
> found a valid image.  This is not the case as an empty area will read
> just fine.  Add a check for a valid IH_MAGIC.
> 
> Signed-off-by: Tom Rini <trini at ti.com>
> Reviewed-by: Peter Korsgaard <jacmet at sunsite.dk>

Applied to u-boot-ti/master, thanks!

-- 
Tom
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