[mutter] Exit, not abort, when we fail to initialize Clutter

[Owen Taylor <otaylor src gnome org>]

commit 3ec3cc248db95384ab8be89e90703908cf37717c
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Wed Oct 28 10:52:03 2015 -0400

    Exit, not abort, when we fail to initialize Clutter
    
    Failing to initialize Clutter isn't something it's useful to report
    into automatic bug tracking systems or get a backtrace for - in fact,
    the most common case is that DISPLAY is unset or points to a
    non-existent X server. So simply exit rather than calling g_error().
    
    https://bugzilla.gnome.org/show_bug.cgi?id=757311

 src/backends/meta-backend.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/backends/meta-backend.c b/src/backends/meta-backend.c
index 4a88c89..79e5f2e 100644
--- a/src/backends/meta-backend.c
+++ b/src/backends/meta-backend.c
@@ -626,7 +626,10 @@ meta_clutter_init (void)
   meta_create_backend ();
 
   if (clutter_init (NULL, NULL) != CLUTTER_INIT_SUCCESS)
-    g_error ("Unable to initialize Clutter.\n");
+    {
+      g_warning ("Unable to initialize Clutter.\n");
+      exit (1);
+    }
 
   /*
    * XXX: We cannot handle high dpi scaling yet, so fix the scale to 1