[gtk+] menuitem: Fix small memory leak in get_label

[Timm Bäder <baedert src gnome org>]

commit 2cd9f43d2fdff7ae01e0a3cd72975c7813b64da9
Author: Timm Bäder <mail baedert org>
Date:   Thu Aug 31 13:14:33 2017 +0200

    menuitem: Fix small memory leak in get_label
    
    g_object_get returs a newly allocated string so we can't use it here.

 gtk/gtkmenuitem.c |   13 ++++---------
 1 files changed, 4 insertions(+), 9 deletions(-)
---
diff --git a/gtk/gtkmenuitem.c b/gtk/gtkmenuitem.c
index 5680bc8..9deb8b4 100644
--- a/gtk/gtkmenuitem.c
+++ b/gtk/gtkmenuitem.c
@@ -1306,15 +1306,10 @@ gtk_real_menu_item_get_label (GtkMenuItem *menu_item)
   gtk_menu_item_ensure_label (menu_item);
 
   child = gtk_bin_get_child (GTK_BIN (menu_item));
-  if (GTK_IS_LABEL (child) ||
-      GTK_IS_ACCEL_LABEL (child))
-    {
-      const char *label;
-
-      g_object_get (child, "label", &label, NULL);
-
-      return label;
-    }
+  if (GTK_IS_LABEL (child))
+    return gtk_label_get_label (GTK_LABEL (child));
+  else if (GTK_IS_ACCEL_LABEL (child))
+    return gtk_accel_label_get_label (GTK_ACCEL_LABEL (child));
 
   return NULL;
 }