Bluetooth: Fix using uninitialized variable when pairing

Commit 6c53823ae0 reshuffled the way the
authentication requirement gets set in the hci_io_capa_request_evt()
function, but at the same time it failed to update an if-statement where
cp.authentication is used before it has been initialized. The correct
value the code should be looking for in this if-statement is
conn->auth_type.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org # 3.16

net/bluetooth/hci_event.c

@@ -3658,7 +3658,7 @@ static void hci_io_capa_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
 			 * except for the no-bonding case.
 			 */
 			if (conn->io_capability != HCI_IO_NO_INPUT_OUTPUT &&
-			    cp.authentication != HCI_AT_NO_BONDING)
+			    conn->auth_type != HCI_AT_NO_BONDING)
 				conn->auth_type |= 0x01;
 
 			cp.authentication = conn->auth_type;