[U-Boot] tools/mkimage: Use proper output parameter in dtc-system call

[Tom Rini]

On Thu, Mar 08, 2018 at 09:00:13AM +0100, Stefan Theil wrote:

> The system call used by mkimage to run dtc redirects stdout to a
> temporary file. This can cause problems on Windows (with a MinGW
> cross-compiled version). Using the "-o" dtc parameter avoids
> this problem.
> 
> Signed-off-by: Stefan Theil <stefan.theil at mixed-mode.de>
> Reviewed-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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