code review 5294074: src/pkg/[n-z]*: gofix -r error

src/pkg/testing/iotest/writer.go

 // Copyright 2009 The Go 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 iotest
 
-import (
-        "io"
-        "os"
-)
+import "io"
 
 // TruncateWriter returns a Writer that writes to w
 // but stops silently after n bytes.
 func TruncateWriter(w io.Writer, n int64) io.Writer {
         return &truncateWriter{w, n}
 }
 
 type truncateWriter struct {
         w io.Writer
         n int64
 }
 
-func (t *truncateWriter) Write(p []byte) (n int, err os.Error) {
+func (t *truncateWriter) Write(p []byte) (n int, err error) {
         if t.n <= 0 {
                 return len(p), nil
         }
         // real write
         n = len(p)
         if int64(n) > t.n {
                 n = int(t.n)
         }
         n, err = t.w.Write(p[0:n])
         t.n -= int64(n)
         if err == nil {
                 n = len(p)
         }
         return
 }