[U-Boot] debug_uart: Try not to use stack in printch

[Tom Rini]

On Thu, Apr 06, 2017 at 04:32:41PM +0100, tim.chick wrote:

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> Content preview:  Previous change to create _printch causes the stack to be
>   used, breaking printch before stack is available. Inline _printch to prevent
>    this happening. Signed-off-by: Tim Chick <tim.chick at mediatek.com> --- [...]
>    
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Applied to u-boot/master, thanks!

-- 
Tom
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