possible loss of data due to missing close when --stdout in force

[Giuliano.Procida]

Hi.

Tested gzip 1.3.3 and 1.3.12 on Linux i386.

When operating with --stdout, gzip fails to close stdout at the end of input. 

This can result in silent loss of data if a partition fills, with the 
probability of silent loss increasing as the size of file decreases.

I've reported the same bug in bzip2 to the author - this one did cause me 
serious problems.

The bad code is in gzip.c:

    if (!to_stdout)
      {
        sigset_t oldset;
        int unlink_errno;

        copy_stat (&istat);
        if (close (ofd) != 0)
          write_error ();

        sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
        remove_ofname_fd = -1;
        unlink_errno = xunlink (ifname) == 0 ? 0 : errno;
        sigprocmask (SIG_SETMASK, &oldset, NULL);

        if (unlink_errno)
          {
            WARN ((stderr, "%s: ", program_name));
            if (!quiet)
              {
                errno = unlink_errno;
                perror (ifname);
              }
          }

The close and error check should happen regardless.

Regards,
Giuliano Procida.

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