Add missing var declaration for local variable flippedFlatPoints

Signed-off-by: Stefan Weil <sw@weilnetz.de>

test/spec/ol/format/polylineformat.test.js

@@ -4,7 +4,7 @@ describe('ol.format.Polyline', function() {
 
   var format;
   var points;
-  var flatPoints, encodedFlatPoints;
+  var flatPoints, encodedFlatPoints, flippedFlatPoints;
   var floats, smallFloats, encodedFloats;
   var signedIntegers, encodedSignedIntegers;
   var unsignedIntegers, encodedUnsignedIntegers;