Remove usage of unsafe from gkvlite

tools/slab/slab_test.go

 package main
 
 // Test integration of gkvlite with go-slab, using gkvlite's optional
 // ItemAddRef/ItemDecRef() callbacks to integrate with a slab memory
 // allocator.
 
 import (
         "bytes"
         "fmt"
         "math/rand"
@@ skipping 131 matching lines @@
                                         if scb.ItemValLength(x, i) != kr4 {
                                                 t.Errorf("expected len: %d, got %d",
                                                         kr4, scb.ItemValLength(x, i))
                                         }
                                         s.ItemDecRef(x, i)
                                 }
                         } else if r < 60 {
                                 numSets++
                                 b := arena.Alloc(kr * kr * kr * kr)
                                 pri := rand.Int31()
-                                it := scb.ItemAlloc(x, uint16(len(k)))
+                                it := scb.ItemAlloc(x, uint32(len(k)))
                                 copy(it.Key, k)
                                 it.Val = b
                                 it.Priority = pri
                                 err := x.SetItem(it)
                                 if err != nil {
                                         t.Errorf("expected nil error, got: %v", err)
                                 }
                                 scb.ItemDecRef(x, it)
                         } else if r < 80 {
                                 _, err := x.Delete(k)
@@ skipping 11 matching lines @@
                 }
                 x.EvictSomeItems()
                 for k := 0; k < numKeys; k++ {
                         _, err := x.Delete([]byte(fmt.Sprintf("%03d", k)))
                         if err != nil {
                                 t.Fatalf("expected nil error, got: %v", err)
                         }
                 }
         }
 }