Bluetooth: Fix LE conn creation

This patch prevents a crash when remote host tries to create a LE
link which already exists. i.e.: call l2test twice passing the
same parameters.
Signed-off-by: Anderson Briglia <anderson.briglia@openbossa.org>
Signed-off-by: Ville Tervo <ville.tervo@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

net/bluetooth/hci_conn.c

@@ -430,7 +430,8 @@ struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8
 
 	if (type == LE_LINK) {
 		le = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst);
-		if (!le)
+		if (le)
+			return NULL;
 		le = hci_conn_add(hdev, LE_LINK, dst);
 		if (!le)
 			return NULL;