[U-Boot] env_callback.h: spl: mark callback as maybe_unused

[Tom Rini]

On Thu, Jul 10, 2014 at 08:38:35PM +0200, Jeroen Hofstee wrote:

> When static inline is used in a header file the function
> should preferably be inlined and if not possible made a
> static function. When declared inside a c file there is a
> static function, which might be inlined. Since SPL uses a
> define to declare the static inline it becomes part of the
> c file although it is declared in a header and clang will
> warn that you have introduced unused static functions. Add
> maybe_unused to prevent such warnings.
> 
> Signed-off-by: Jeroen Hofstee <jeroen at myspectrum.nl>

Applied to u-boot/master, thanks!

-- 
Tom
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