[U-Boot] openrisc: Fix a few type cast related warnings

[Tom Rini]

On Tue, Aug 26, 2014 at 01:46:17PM +0300, Vasili Galka wrote:
> Use size_t type for positive offsets instead of the loff_t type. The
> later is defined as long long, which is larger than the pointer type
> on OpenRISC architecture and therefore the following warning was
> generated:
> 
> "warning: cast to pointer from integer of different size"
> 
> Signed-off-by: Vasili Galka <vvv444 at gmail.com>

Applied to u-boot/master, thanks!

-- 
Tom
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