[gtk/ci-gtk3-update: 20/20] Silence a compiler warning

[Emmanuele Bassi <ebassi src gnome org>]

commit b4808c187f23489ae075e99a04c484fa923b8b0f
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Mar 13 16:05:13 2020 +0000

    Silence a compiler warning
    
    GCC complains with boxed out arguments that may be unset.

 gtk/gtkcssgadget.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtkcssgadget.c b/gtk/gtkcssgadget.c
index b07e3159ff..167e0a4859 100644
--- a/gtk/gtkcssgadget.c
+++ b/gtk/gtkcssgadget.c
@@ -541,7 +541,7 @@ gtk_css_gadget_margin_box_contains_point (GtkCssGadget *gadget,
                                           int           x,
                                           int           y)
 {
-  GtkAllocation margin_box;
+  GtkAllocation margin_box = { 0, };
   gtk_css_gadget_get_margin_box (gadget, &margin_box);
   return allocation_contains_point (&margin_box, x, y);
 }