[gtk+] overlay: Don't access priv pointer before typ check

[Timm Bäder <baedert src gnome org>]

commit ddbafa023aea4ba340731a07def111ad228dfa34
Author: Timm Bäder <mail baedert org>
Date:   Sat Jan 23 10:30:53 2016 +0100

    overlay: Don't access priv pointer before typ check

 gtk/gtkoverlay.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkoverlay.c b/gtk/gtkoverlay.c
index 661f3d1..b9208a9 100644
--- a/gtk/gtkoverlay.c
+++ b/gtk/gtkoverlay.c
@@ -868,12 +868,13 @@ void
 gtk_overlay_add_overlay (GtkOverlay *overlay,
                          GtkWidget  *widget)
 {
-  GtkOverlayPrivate *priv = overlay->priv;
+  GtkOverlayPrivate *priv;
   GtkOverlayChild *child;
 
   g_return_if_fail (GTK_IS_OVERLAY (overlay));
   g_return_if_fail (GTK_IS_WIDGET (widget));
 
+  priv = overlay->priv;
   child = g_slice_new0 (GtkOverlayChild);
   child->widget = widget;