[U-Boot] env: suppress a spurious warning with GCC 7.1

[Tom Rini]

On Tue, Nov 21, 2017 at 11:29:40PM +0100, Philipp Tomsich wrote:

> GCC 7.1 seems to be smart enough to track val through the various
> static inline functions, but not smart enough to see that val will
> always be initialised when no error is returned.  This triggers
> the following warning:
>   env/mmc.c: In function 'mmc_get_env_addr':
>   env/mmc.c:121:12: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized]
> 
> To make it easier for compiler to understand what is going on, let's
> initialise val.
> 
> Signed-off-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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