ui/vdagent: fix leak on error path

"info" was leaked when more than 10 entries.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210805135715.857938-2-marcandre.lureau@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>

include/ui/clipboard.h

@@ -190,4 +190,6 @@ void qemu_clipboard_set_data(QemuClipboardPeer *peer,
                              const void *data,
                              bool update);
 
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(QemuClipboardInfo, qemu_clipboard_info_unref)
+
 #endif /* QEMU_CLIPBOARD_H */

ui/vdagent.c

@@ -438,7 +438,7 @@ static void vdagent_chr_recv_clipboard(VDAgentChardev *vd, VDAgentMessage *msg)
     uint8_t s = VD_AGENT_CLIPBOARD_SELECTION_CLIPBOARD;
     uint32_t size = msg->size;
     void *data = msg->data;
-    QemuClipboardInfo *info;
+    g_autoptr(QemuClipboardInfo) info = NULL;
     QemuClipboardType type;
 
     if (have_selection(vd)) {
@@ -477,7 +477,6 @@ static void vdagent_chr_recv_clipboard(VDAgentChardev *vd, VDAgentMessage *msg)
             size -= sizeof(uint32_t);
         }
         qemu_clipboard_update(info);
-        qemu_clipboard_info_unref(info);
         break;
     case VD_AGENT_CLIPBOARD_REQUEST:
         if (size < sizeof(uint32_t)) {
@@ -523,7 +522,6 @@ static void vdagent_chr_recv_clipboard(VDAgentChardev *vd, VDAgentMessage *msg)
             /* set empty clipboard info */
             info = qemu_clipboard_info_new(NULL, s);
             qemu_clipboard_update(info);
-            qemu_clipboard_info_unref(info);
         }
         break;
     }