[libnotify] Fix assertion when uniniting without any notifications

[Martin Pitt <martinpitt src gnome org>]

commit 1a103f1eee373882a7ed5e2225fcd23bb10ecbc8
Author: Martin Pitt <martin pitt ubuntu com>
Date:   Thu Jul 1 14:30:54 2010 +0200

    Fix assertion when uniniting without any notifications
    
    The lazy initialization from commit 3dc04fa caused a small regression: When a
    process would init and uninit libnotify without ever sending a notification,
    _proxy was still NULL, which caused an assertion
    
    (process:20953): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed
    
    Bug-Ubuntu: https://bugs.launchpad.net/bugs/570462

 libnotify/notify.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/libnotify/notify.c b/libnotify/notify.c
index a24a5fd..8491cf1 100644
--- a/libnotify/notify.c
+++ b/libnotify/notify.c
@@ -182,7 +182,9 @@ notify_uninit (void)
                 }
         }
 
-        g_object_unref (_proxy);
+        if (_proxy != NULL) {
+            g_object_unref (_proxy);
+        }
 
         _initted = FALSE;
 }