[gnome-shell] Check error of g_dbus_proxy_new_sync call

[Matthias Clasen <matthiasc src gnome org>]

commit 18c713823719c9876a9824ba4bd0ba5c41cc07be
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Sep 24 13:31:07 2015 -0400

    Check error of g_dbus_proxy_new_sync call
    
    Otherwise errors pile up and we crash later on.

 src/main.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/src/main.c b/src/main.c
index b33d4bf..e8ac998 100644
--- a/src/main.c
+++ b/src/main.c
@@ -132,6 +132,12 @@ shell_dbus_init (gboolean replace)
                                NULL, /* cancellable */
                                &error);
 
+  if (!bus)
+    {
+      g_printerr ("Failed to get a session bus proxy: %s", error->message);
+      exit (1);
+    }
+
   request_name_flags = G_BUS_NAME_OWNER_FLAGS_ALLOW_REPLACEMENT;
   if (replace)
     request_name_flags |= DBUS_NAME_FLAG_REPLACE_EXISTING;