[PATCH] libio: use _IO_have_wbackup for wide streams

[Florian Weimer]

* Andreas Schwab:

> Fix two wrong uses of _IO_have_backup on a wide stream.
> ---
>  libio/wgenops.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/libio/wgenops.c b/libio/wgenops.c
> index 5f36bc49a1..c2a8541b6d 100644
> --- a/libio/wgenops.c
> +++ b/libio/wgenops.c
> @@ -270,7 +270,7 @@ __wunderflow (FILE *fp)
>        if (save_for_wbackup (fp, fp->_wide_data->_IO_read_end))
>  	return WEOF;
>      }
> -  else if (_IO_have_backup (fp))
> +  else if (_IO_have_wbackup (fp))
>      _IO_free_wbackup_area (fp);
>    return _IO_UNDERFLOW (fp);
>  }
> @@ -603,6 +603,6 @@ _IO_unsave_wmarkers (FILE *fp)
>        fp->_markers = NULL;
>      }
>  
> -  if (_IO_have_backup (fp))
> +  if (_IO_have_wbackup (fp))
>      _IO_free_wbackup_area (fp);
>  }

I believe this okay.  It's not a visible bug because even if we don't
free the allocation here, it gets freed in fclose.  We don't support
dual-orientation streams, so _IO_have_wbackup should always be false.

Reviewed-by: Florian Weimer <fweimer@redhat.com>

Thanks,
Florian