ata: sunxi: fix debug messages

It is useless and misleading to print the ret variable that is not set
by the dev_read_addr routine. Also, move the '\n' character after the
round bracket that contains the error code.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>