xwiishow: clear error line correctly
xwiishow: clear error line correctly

We need to erase previous error messages before writing a new one to avoid
left-overs if the new message is shorter than the old one.

Signed-off-by: David Herrmann <fb53b2ddb8d141e0cb39d7c67c2f81b6bc2eb0f7@gmail.com>

barracks510/xwiimote,barracks510/xwiimote,dvdhrm/xwiimote,AdamLuchjenbroers/xwiimote,AdamLuchjenbroers/xwiimote,barracks510/xwiimote,barracks510/xwiimote,dvdhrm/xwiimote