tools: kwboot: Fix printing progress

Ensure that `pos` is still in range up to the `width` so printing 100%
works also for bigger images. After printing 100% progress reset it to
zero, so that next progressbar can be started.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
1 file changed