rewrite but this time not killing array structure by setting to a new var

git-svn-id: http://svn.openlayers.org/trunk/openlayers@1189 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Tile/WFS.js

@@ -48,8 +48,9 @@ OpenLayers.Tile.WFS.prototype =
      *   be reused in a new location.
      */
     clear: function() {
-        for(var i=0; i < this.features.length; i++) {
-            this.features[i].destroy();
+        while(this.features.length > 0) {
+            var feature = this.features.shift();
+            feature.destroy();
         }
     },