Bluetooth: Refactor valid LTK data testing into its own function

This patch refactors valid LTK data testing into its own function. This
will help keep the code readable since there are several tests still
missing that need to be done on the LTK data.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

net/bluetooth/mgmt.c

@@ -2701,6 +2701,13 @@ static int set_fast_connectable(struct sock *sk, struct hci_dev *hdev,
 	return err;
 }
 
+static bool ltk_is_valid(struct mgmt_ltk_info *key)
+{
+	if (key->master != 0x00 && key->master != 0x01)
+		return false;
+	return true;
+}
+
 static int load_long_term_keys(struct sock *sk, struct hci_dev *hdev,
 			       void *cp_data, u16 len)
 {
@@ -2724,7 +2731,7 @@ static int load_long_term_keys(struct sock *sk, struct hci_dev *hdev,
 	for (i = 0; i < key_count; i++) {
 		struct mgmt_ltk_info *key = &cp->keys[i];
 
-		if (key->master != 0x00 && key->master != 0x01)
+		if (!ltk_is_valid(key))
 			return cmd_status(sk, hdev->id,
 					  MGMT_OP_LOAD_LONG_TERM_KEYS,
 					  MGMT_STATUS_INVALID_PARAMS);