[U-Boot] spl_mmc: cleanup variable types

[Tom Rini]

On Thu, Mar 21, 2013 at 04:55:17AM -0000, Peter Korsgaard wrote:

> block_read returns unsigned long, so it doesn't make sense to check for
> < 0. and neither does marking the header structure as const and then
> casting away the constness to load data into it.
> 
> Also cleanup some unneeded pointer casting while we're at it.
> 
> Signed-off-by: Peter Korsgaard <peter.korsgaard at barco.com>
> Reviewed-by: Tom Rini <trini at ti.com>

Applied to u-boot/master, thanks!

-- 
Tom
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