Possible leak

[Bbulatov]

Hello!
During the static analysis was found possible mistake:

1. The handle 'file' is created at targz.go:284 by calling function 'os.Create' and lost at targz.go:303.

file, err := os.Create(filename)
		if err != nil {
			return err
		}

		writer := bufio.NewWriter(file)

		buffer := make([]byte, 4096)
		for {
			n, err := tarReader.Read(buffer)
			if err != nil && err != io.EOF {
				panic(err)
			}
			if n == 0 {
				break
			}

			_, err = writer.Write(buffer[:n])
			if err != nil {
				return err
			}
		}

Please clarify whether this requires correction?