Merge "LeScanner: null check of BluetoothGatt" into main

    @RequiresPermission(android.Manifest.permission.BLUETOOTH_SCAN)

    public void stopScan(PendingIntent callbackIntent) {

        BluetoothLeUtils.checkAdapterStateOn(mBluetoothAdapter);

        IBluetoothGatt gatt;

        try {

            gatt = mBluetoothAdapter.getBluetoothGatt();

            IBluetoothGatt gatt = mBluetoothAdapter.getBluetoothGatt();

            if (gatt == null) {

                Log.w(TAG, "stopScan called after bluetooth has been turned off");

                return;

            }

            final SynchronousResultReceiver recv = SynchronousResultReceiver.get();

            gatt.stopScanForIntent(callbackIntent, mAttributionSource, recv);

            recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(null);