marker: Fix onRemove handler

this._map is nulled before removeIcon call

Signed-off-by: Pavel Shramov <shramov@mexmat.net>

Author: shramov

src/layer/marker/Marker.js

@@ -28,9 +28,8 @@ L.Marker = L.Class.extend({
 	},
 
 	onRemove: function(map) {
-		this._map = null;
-
 		this._removeIcon();
+		this._map = null;
 
 		// TODO move to Marker.Popup.js
 		if (this.closePopup) {