menubar: prefer early return

gtk/gtkmenubar.c

@@ -512,8 +512,9 @@ gtk_menu_bar_allocate (GtkCssGadget        *gadget,
   menu_shell = GTK_MENU_SHELL (widget);
   priv = menu_bar->priv;
 
-  if (menu_shell->priv->children)
-    {
+  if (!menu_shell->priv->children)
+    return;
+
   remaining_space = *allocation;
   requested_sizes = g_array_new (FALSE, FALSE, sizeof (GtkRequestedSize));
 
@@ -629,7 +630,7 @@ gtk_menu_bar_allocate (GtkCssGadget        *gadget,
 
   g_array_free (requested_sizes, TRUE);
 }
-}
+
 static void
 gtk_menu_bar_size_allocate (GtkWidget     *widget,
 			    GtkAllocation *allocation)