Bluetooth: btusb: Don't suspend when there are connections

This checks if there are connections before suspending since that may
disrupt the connections making it stop receiving any data if remote
wakeup is not enabled.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

drivers/bluetooth/btusb.c

@@ -4629,6 +4629,10 @@ static int btusb_suspend(struct usb_interface *intf, pm_message_t message)
 
 	BT_DBG("intf %p", intf);
 
+	/* Don't suspend if there are connections */
+	if (hci_conn_count(data->hdev))
+		return -EBUSY;
+
 	if (data->suspend_count++)
 		return 0;