[PATCH v5 01/18] ui: avoid compiler warnings from unused clipboard info variable

["Daniel P. Berrangé" <berrange@redhat.com>]

With latest clang 13.0.0 we get

../ui/clipboard.c:47:34: error: variable 'old' set but not used [-Werror,-Wunused-but-set-variable]
    g_autoptr(QemuClipboardInfo) old = NULL;
                                 ^

The compiler can't tell that we only declared this variable in
order to get the side effect of free'ing it when out of scope.

This pattern is a little dubious for a use of g_autoptr, so
rewrite the code to avoid it.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@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..7672058e84 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];
+    qemu_clipboard_info_unref(cbinfo[info->selection]);
     cbinfo[info->selection] = qemu_clipboard_info_ref(info);
 }
 
-- 
2.33.1