Re: [PATCH v2 2/2] ui/clipboard: Don't use g_autoptr just to free a variable

[Daniel P . Berrangé]

On Tue, Dec 07, 2021 at 03:40:38PM -0500, John Snow wrote:
> Clang doesn't recognize that the variable is being "used" and will emit
> a warning:
> 
>   ../ui/clipboard.c:47:34: error: variable 'old' set but not used 
> [-Werror,-Wunused-but-set-variable]
>       g_autoptr(QemuClipboardInfo) old = NULL;
>                                  ^
>   1 error generated.
> 
> OK, fine. Just do things the old way.
> 
> Signed-off-by: John Snow <jsnow@redhat.com>
> ---
>  ui/clipboard.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/ui/clipboard.c b/ui/clipboard.c
> index d7b008d62a..9ab65efefb 100644
> --- a/ui/clipboard.c
> +++ b/ui/clipboard.c
> @@ -44,12 +44,11 @@ void qemu_clipboard_peer_release(QemuClipboardPeer *peer,
>  
>  void qemu_clipboard_update(QemuClipboardInfo *info)
>  {
> -    g_autoptr(QemuClipboardInfo) old = NULL;
>      assert(info->selection < QEMU_CLIPBOARD_SELECTION__COUNT);
>  
>      notifier_list_notify(&clipboard_notifiers, info);
>  
> -    old = cbinfo[info->selection];
> +    g_free(cbinfo[info->selection]);

This is a ref counted data type - it can't use g_free:

  https://lists.gnu.org/archive/html/qemu-devel/2021-11/msg04890.html

>      cbinfo[info->selection] = qemu_clipboard_info_ref(info);
>  }

Regards,
Daniel
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