Fix memory corruption bug in impl/memory

impl/memory/datastore_test.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package memory
 
 import (
         "fmt"
         "testing"
         "time"
@@ skipping 523 matching lines @@
 }
 
 func TestCompoundIndexes(t *testing.T) {
         t.Parallel()
 
         idxKey := func(def dsS.IndexDefinition) string {
                 So(def, ShouldNotBeNil)
                 return "idx::" + string(serialize.ToBytes(*def.PrepForIdxTable()))
         }
 
-        numItms := func(c *memCollection) uint64 {
+        numItms := func(c memCollection) uint64 {
                 ret, _ := c.GetTotals()
                 return ret
         }
 
         Convey("Test Compound indexes", t, func() {
                 type Model struct {
                         ID int64 `gae:"$id"`
 
                         Field1 []string
                         Field2 []int64
@@ skipping 122 matching lines @@
                         // Add "foos" to a new namesapce, then confirm that it gets indexed.
                         So(dsS.Get(infoS.Get(ctx).MustNamespace("qux")).PutMulti(foos), ShouldBeNil)
                         dsS.Get(ctx).Testable().CatchupIndexes()
 
                         results = nil
                         So(dsS.Get(infoS.Get(ctx).MustNamespace("qux")).GetAll(q, &results), ShouldBeNil)
                         So(len(results), ShouldEqual, 2)
                 })
         })
 }