[at-spi2-core] Do not query X unless DISPLAY or AT_SPI_DISPLAY are set

[Mike Gorse <mgorse src gnome org>]

commit 725b582d70873d2205dee622fa410894f28a67e9
Author: Mike Gorse <mgorse suse com>
Date:   Thu Aug 8 11:21:15 2013 -0500

    Do not query X unless DISPLAY or AT_SPI_DISPLAY are set
    
    Previously, AT-SPI would hard-code a default display name of ":0" if
    neither DISPLAY nor AT_SPI_DISPLAY were set. This seems unnecessary--the
    environment variable ought to be set--and causes a warning to be
    generated whenever a Gtk app is started under Wayland.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=701378

 atspi/atspi-misc.c |   13 +++++++------
 1 files changed, 7 insertions(+), 6 deletions(-)
---
diff --git a/atspi/atspi-misc.c b/atspi/atspi-misc.c
index 12a2947..17f9bb2 100644
--- a/atspi/atspi-misc.c
+++ b/atspi/atspi-misc.c
@@ -870,7 +870,7 @@ spi_display_name (void)
     {
       display_env = g_getenv ("DISPLAY");
       if (!display_env || !display_env[0])
-        canonical_display_name = g_strdup (":0");
+        return NULL;
       else
         {
           gchar *display_p, *screen_p;
@@ -1468,11 +1468,12 @@ get_accessibility_bus_address_x11 (void)
   char *display_name;
 
   display_name = spi_display_name ();
-  if (display_name != NULL)
-    {
-      bridge_display = XOpenDisplay (display_name);
-      g_free (display_name);
-    }
+  if (!display_name)
+    return NULL;
+
+  bridge_display = XOpenDisplay (display_name);
+  g_free (display_name);
+
   if (!bridge_display)
     {
       g_warning ("Could not open X display");