[U-Boot] jffs2: Fix set but not used warning

[Tom Rini]

On Sun, Mar 27, 2016 at 02:48:36PM -0400, Tom Rini wrote:

> We only use 'ofs' in jffs2_sum_scan_sumnode when debugging as it's part
> of a dbg_summary call.  Mark this as __maybe_unused.
> 
> Signed-off-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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