[gnome-initial-setup: 1/2] gis-driver: Avoid a warning about connecting to a NULL object

[Will Thompson <wjt src gnome org>]

commit 8663ff104b9e900fc182d77b886f5d9902bb575d
Author: Philip Withnall <withnall endlessm com>
Date:   Mon Aug 17 18:09:57 2020 +0100

    gis-driver: Avoid a warning about connecting to a NULL object
    
    `gdk_screen_get_default()` is not guaranteed to return a result.
    In some circumstances (doesn’t matter which) it can return `NULL`.
    Connecting to a signal on a `NULL` object emits a warning; avoid that.
    
    Signed-off-by: Philip Withnall <withnall endlessm com>

 gnome-initial-setup/gis-driver.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/gnome-initial-setup/gis-driver.c b/gnome-initial-setup/gis-driver.c
index f6f9a049..2332aee0 100644
--- a/gnome-initial-setup/gis-driver.c
+++ b/gnome-initial-setup/gis-driver.c
@@ -927,8 +927,9 @@ gis_driver_init (GisDriver *driver)
 
   load_vendor_conf_file (driver);
 
-  g_signal_connect (screen, "size-changed",
-                    G_CALLBACK (screen_size_changed), driver);
+  if (screen != NULL)
+    g_signal_connect (screen, "size-changed",
+                      G_CALLBACK (screen_size_changed), driver);
 }
 
 static void