Bluetooth: Fix reporting invalid RSSI for LE devices

Start Discovery was reporting 0 RSSI for invalid RSSI only for
BR/EDR devices. LE devices were reported with RSSI 127.
Signed-off-by: Szymon Janc <szymon.janc@tieto.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org # 3.19+

net/bluetooth/mgmt.c

@@ -7238,7 +7238,8 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
 	 * However when using service discovery, the value 127 will be
 	 * returned when the RSSI is not available.
 	 */
-	if (rssi == HCI_RSSI_INVALID && !hdev->discovery.report_invalid_rssi)
+	if (rssi == HCI_RSSI_INVALID && !hdev->discovery.report_invalid_rssi &&
+	    link_type == ACL_LINK)
 		rssi = 0;
 
 	bacpy(&ev->addr.bdaddr, bdaddr);