i2c: i801: unregister tco_pdev in i801_probe() error path

We have to unregister tco_pdev also if i2c_add_adapter() fails.

Fixes: 94246930 ("i2c: i801: Create iTCO device on newer Intel PCHs")
Cc: stable@vger.kernel.org
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>