a few code simplifications

ran gosimple over the code and made suggested adjustments

attrs.go

@@ -118,7 +118,7 @@ func getFileStat(flags uint32, b []byte) (*FileStat, []byte) {
 	if flags&ssh_FILEXFER_ATTR_EXTENDED == ssh_FILEXFER_ATTR_EXTENDED {
 		var count uint32
 		count, b = unmarshalUint32(b)
-		ext := make([]StatExtended, count, count)
+		ext := make([]StatExtended, count)
 		for i := uint32(0); i < count; i++ {
 			var typ string
 			var data string

client_integration_test.go

@@ -62,7 +62,7 @@ func newDelayedWriter(w io.WriteCloser, delay time.Duration) io.WriteCloser {
 	closed := make(chan struct{})
 	go func() {
 		for writeMsg := range ch {
-			time.Sleep(writeMsg.t.Add(delay).Sub(time.Now()))
+			time.Sleep(time.Until(writeMsg.t.Add(delay)))
 			n, err := w.Write(writeMsg.b)
 			if err != nil {
 				panic("write error")

request-example.go

@@ -139,7 +139,7 @@ func (fs *root) Filelist(r *Request) (ListerAt, error) {
 				ordered_names = append(ordered_names, fn)
 			}
 		}
-		sort.Sort(sort.StringSlice(ordered_names))
+		sort.Strings(ordered_names)
 		list := make([]os.FileInfo, len(ordered_names))
 		for i, fn := range ordered_names {
 			list[i] = fs.files[fn]

server_integration_test.go

@@ -426,7 +426,7 @@ func runSftpClient(t *testing.T, script string, path string, host string, port i
 		return "", err
 	}
 	err = cmd.Wait()
-	return string(stdout.Bytes()), err
+	return stdout.String(), err
 }
 
 func TestServerCompareSubsystems(t *testing.T) {