Bluetooth: uart-ldisc: Fix memory leak

This is a partial, self-contained, minimal backport of commit
797fe796 upstream which fixes the memory
leak:

Bluetooth: uart-ldisc: Fix memory leak and remove destruct cb

We currently leak the hci_uart object if HCI_UART_PROTO_SET is never set
because the hci-destruct callback will then never be called.  This fix
removes the hci-destruct callback and frees the driver internal private
hci_uart object directly on tty-close. We call hci_unregister_dev() here
so the hci-core will never call our callbacks again (except destruct).
Therefore, we can safely free the driver internal data right away and
set the destruct callback to NULL.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/bluetooth/hci_ldisc.c

@@ -237,7 +237,6 @@ static void hci_uart_destruct(struct hci_dev *hdev)
 		return;
 
 	BT_DBG("%s", hdev->name);
-	kfree(hdev->driver_data);
 }
 
 /* ------ LDISC part ------ */
@@ -316,6 +315,7 @@ static void hci_uart_tty_close(struct tty_struct *tty)
 				hci_free_dev(hdev);
 			}
 		}
+		kfree(hu);
 	}
 }