rpc_util: remove a wrong test

- Our shared buffer pool does not provide initialization, but it performs better. Users must initialize data from the pool themselves if necessary.

shared_buffer_pool.go

@@ -30,6 +30,8 @@ import "sync"
 // later release.
 type SharedBufferPool interface {
 	// Get returns a buffer with specified length from the pool.
+	//
+	// The returned byte slice may be not zero initialized.
 	Get(length int) []byte
 
 	// Put returns a buffer to the pool.

shared_buffer_pool_test.go

@@ -42,12 +42,6 @@ func (s) TestSharedBufferPool(t *testing.T) {
 				t.Fatalf("Expected buffer of length %d, got %d", l, len(bs))
 			}
 
-			for i, b := range bs {
-				if b != 0 {
-					t.Fatalf("Expected buffer to be zeroed, got %d at index %d", b, i)
-				}
-			}
-
 			p.Put(&bs)
 		}
 	}