Bluetooth: HCI: Fix definition of hci_rp_delete_stored_link_key

num_keys is actually 2 octects not 1:

BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 4, Part E
page 1989:

  Num_Keys_Deleted:
  Size: 2 octets
  0xXXXX	Number of Link Keys Deleted
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

include/net/bluetooth/hci.h

@@ -1058,7 +1058,7 @@ struct hci_cp_delete_stored_link_key {
 } __packed;
 struct hci_rp_delete_stored_link_key {
 	__u8     status;
-	__u8     num_keys;
+	__le16   num_keys;
 } __packed;
 
 #define HCI_MAX_NAME_LENGTH		248

net/bluetooth/hci_event.c

@@ -272,7 +272,7 @@ static void hci_cc_delete_stored_link_key(struct hci_dev *hdev,
 		return;
 
 	if (rp->num_keys <= hdev->stored_num_keys)
-		hdev->stored_num_keys -= rp->num_keys;
+		hdev->stored_num_keys -= le16_to_cpu(rp->num_keys);
 	else
 		hdev->stored_num_keys = 0;
 }