tools: kwboot: Print newline on error when progress was not completed

When progress was not completed, current terminal position is in progress
bar. So print newline before printing error message to make error message
more readable.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/tools/kwboot.c b/tools/kwboot.c
index eb4b3fe..0e533e3 100644
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -459,6 +459,7 @@
 	rc = kwboot_tty_send_char(tty, EOT);
 
 out:
+	kwboot_printv("\n");
 	return rc;
 
 can: