[U-Boot] mkimage: do not fail if there is no print_header function

[Tom Rini]

On Fri, Mar 30, 2018 at 10:28:19AM +0200, Guillaume GARDET wrote:

> Commit 253c60a breaks the exit value of 'mkimage -T rkimage'
> and print the following  error:
>   mkimage: Can't print header for Rockchip Boot Image support: Success
> 
> It is not a failure to not print headers, so just display the warning message,
> and finish the function properly.
> 
> Signed-off-by: Guillaume GARDET <guillaume.gardet at free.fr>
> 
> Cc: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> Cc: Simon Glass <sjg at chromium.org>
> Cc: Tom Rini <trini at konsulko.com>
> Reviewed-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>

Applied to u-boot/master, thanks!

-- 
Tom
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