[U-Boot] [U-Boot, v2] mkimage: Fix argument parsing with signature comment

[Tom Rini]

On Tue, Aug 02, 2016 at 06:57:14PM +0000, Karl Beldan wrote:

> Inform getopt that '-c' requires a parameter.
> 
> Fixes: a02221f29deb ("mkimage: Convert to use getopt()")
> Signed-off-by: Karl Beldan <kbeldan at baylibre.com>
> Reviewed-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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