Abort drawing to clear the sketch feature

src/ol/interaction/draw.js

@@ -376,6 +376,7 @@ ol.interaction.Draw.handleUpEvent_ = function(event) {
     pass = false;
   } else if (circleMode && this.freehand_) {
     this.finishCoordinate_ = null;
+    this.abortDrawing_();
   }
   return pass;
 };