[U-Boot] [U-Boot,v1] scripts/check-config.sh: Add usage()

[Tom Rini]

On Tue, Dec 11, 2018 at 06:22:28PM +0200, Andy Shevchenko wrote:

> When arguments are not supplied the error message is misleading and
> doesn't tell what exactly has to be done.
> 
> Fix this by adding usage() and call it if above circumstance occurs.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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