Fixed Cache Store.Memory usage of Object#reduce()

lib/express/plugins/cache.js

@@ -126,12 +126,13 @@ exports.Store.Memory = exports.Store.extend({
       return callback(this.data[key] instanceof Cache
         ? this.data[key].val
         : null)
-    var regexp = this.normalize(key)      
-    callback(this.data.reduce(function(vals, cache){
-      if (regexp.test(cache.key))
-        vals[cache.key] = cache.val
-      return vals
-    }, {}))
+    var regexp = this.normalize(key),
+        keys = Object.keys(this.data),
+        matches = {}
+    for (var i = 0, len = keys.length; i < len; ++i)
+      if (regexp.test(keys[i]))
+        matches[keys[i]] = this.data[keys[i]]
+    return matches
   },
   
   /**