tiny-printf: Avoid printing NULL strings
Add a check for NULL strings to avoid printing junk to the console. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NStefan Roese <sr@denx.de>
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Add a check for NULL strings to avoid printing junk to the console. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NStefan Roese <sr@denx.de>