Bluetooth: Fix resetting HCI_MGMT flag

The HCI_MGMT flag should not be cleared when resetting a HCI device.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 2d39ede..f3dafae 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -195,7 +195,8 @@
 
 	hci_req_complete(hdev, HCI_OP_RESET, status);
 
-	hdev->dev_flags = 0;
+	/* Reset all flags, except persistent ones like HCI_MGMT */
+	hdev->dev_flags &= BIT(HCI_MGMT);
 }
 
 static void hci_cc_write_local_name(struct hci_dev *hdev, struct sk_buff *skb)