[libadwaita] tab-box: Fix a memory leak

[Alexander Mikhaylenko <alexm src gnome org>]

commit 5378f8979ed9267bec173e41863544c33ab65ee2
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Fri Nov 19 17:58:31 2021 +0500

    tab-box: Fix a memory leak

 src/adw-tab-box.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/adw-tab-box.c b/src/adw-tab-box.c
index 0e13663f..f97d7b46 100644
--- a/src/adw-tab-box.c
+++ b/src/adw-tab-box.c
@@ -2332,9 +2332,9 @@ static void
 begin_drag (AdwTabBox *self,
             GdkDevice *device)
 {
+  g_autoptr (GdkContentProvider) content = NULL;
   GtkNative *native;
   GdkSurface *surface;
-  GdkContentProvider *content;
   GdkDrag *drag;
   TabInfo *detached_info;
   AdwTab *detached_tab;