[U-Boot] sandbox: fix the return type of os_free() function

[Tom Rini]

On Wed, Jan 15, 2014 at 01:06:41PM +0900, Masahiro Yamada wrote:

> The function os_free() returns nothing.
> Its return type should be "void" rather than "void *".
> 
> Signed-off-by: Masahiro Yamada <yamada.m at jp.panasonic.com>

Applied to u-boot/master, thanks!

-- 
Tom
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