[U-Boot] Fix Ymodem build when DEBUG and CONFIG_USE_TINY_PRINTF are selected

[Tom Rini]

On Thu, May 03, 2018 at 11:45:08AM +0000, Alex Kiernan wrote:

> Attempting to build with both DEBUG and CONFIG_USE_TINY_PRINTF along
> with CONFIG_SPL_YMODEM_SUPPORT fails at link time:
> 
>   common/built-in.o: In function `zm_dprintf':
>   common/xyzModem.c:190: undefined reference to `vsprintf'
> 
> Disable Ymodem debug if we don't have full vsprintf support.
> 
> Signed-off-by: Alex Kiernan <alex.kiernan at gmail.com>
> Reviewed-by: Joe Hershberger <joe.hershberger at ni.com>

Applied to u-boot/master, thanks!

-- 
Tom
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