Bluetooth: Simplify a the connection type handling

Now that we have separate ways of doing connections for each link type,
we can do better than an "if" statement to handle each link type.
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

net/bluetooth/hci_conn.c

@@ -568,13 +568,16 @@ struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst,
 {
 	BT_DBG("%s dst %s", hdev->name, batostr(dst));
 
-	if (type == LE_LINK)
+	switch (type) {
+	case LE_LINK:
 		return hci_connect_le(hdev, dst, dst_type, sec_level, auth_type);
-
-	if (type == ACL_LINK)
+	case ACL_LINK:
 		return hci_connect_acl(hdev, dst, sec_level, auth_type);
+	case SCO_LINK:
+		return hci_connect_sco(hdev, dst, sec_level, auth_type);
+	}
 
-	return hci_connect_sco(hdev, dst, sec_level, auth_type);
+	return ERR_PTR(-EINVAL);
 }
 
 /* Check link security requirement */