[gnome-builder] pnl: simplify add func

[Christian Hergert <chergert src gnome org>]

commit c7c4fa2822f64b1c8020c3339216da6c37e8d5ba
Author: Christian Hergert <chergert redhat com>
Date:   Fri Apr 14 01:04:51 2017 -0700

    pnl: simplify add func

 contrib/pnl/pnl-dock-bin-edge.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)
---
diff --git a/contrib/pnl/pnl-dock-bin-edge.c b/contrib/pnl/pnl-dock-bin-edge.c
index ac9d19d..408ceb2 100644
--- a/contrib/pnl/pnl-dock-bin-edge.c
+++ b/contrib/pnl/pnl-dock-bin-edge.c
@@ -138,11 +138,7 @@ pnl_dock_bin_edge_add (GtkContainer *container,
   g_assert (GTK_IS_WIDGET (widget));
 
   child = gtk_bin_get_child (GTK_BIN (container));
-
-  if (GTK_IS_CONTAINER (child))
-    gtk_container_add (GTK_CONTAINER (child), widget);
-  else
-    GTK_CONTAINER_CLASS (pnl_dock_bin_edge_parent_class)->add (container, widget);
+  gtk_container_add (GTK_CONTAINER (child), widget);
 }
 
 static void