tools: kwboot: Print trailing newline after terminal is terminated

Print trailing newline as the last printed byte can be something
different.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Chris Packham <judge.packham@gmail.com>
Tested-by: Chris Packham <judge.packham@gmail.com>

tools/kwboot.c

@@ -560,6 +560,7 @@ kwboot_terminal(int tty)
 
 	if (in >= 0)
 		tcsetattr(in, TCSANOW, &otio);
+	printf("\n");
 out:
 	return rc;
 }