[gtk/ci-release] Initialize an out argument

[Emmanuele Bassi <ebassi src gnome org>]

commit aefa36a80ec67901578a27496f017b2de3613dcb
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Jan 14 15:17:06 2020 +0000

    Initialize an out argument
    
    Avoids a compiler error, and undefined values in an error path.

 gdk/broadway/gdkdevice-broadway.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gdk/broadway/gdkdevice-broadway.c b/gdk/broadway/gdkdevice-broadway.c
index 801b021c56..52ffa719db 100644
--- a/gdk/broadway/gdkdevice-broadway.c
+++ b/gdk/broadway/gdkdevice-broadway.c
@@ -303,7 +303,7 @@ gdk_broadway_device_surface_at_position (GdkDevice       *device,
                                          GdkModifierType *mask,
                                          gboolean         get_toplevel)
 {
-  GdkSurface *surface;
+  GdkSurface *surface = NULL;
 
   gdk_broadway_device_query_state (device, NULL, &surface, NULL, NULL, win_x, win_y, mask);