[U-Boot] [U-Boot,v3] bug.h: introduce WARN_ONCE

[Tom Rini]

On Wed, Jun 06, 2018 at 12:38:59AM +0300, Ramon Fried wrote:

> Add WARN_ONCE definition to allow single time notification
> of warnings to the user.
> Taken from Linux kernel (4.17) with slight changes
> (Removed __section(.data.once))
> 
> Signed-off-by: Ramon Fried <ramon.fried at gmail.com>

Applied to u-boot/master, thanks!

-- 
Tom
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