[evolution-data-server/gnome-3-18] source_registry_server_process_file_monitor_event - Correct possible runtime warning

[Milan Crha <mcrha src gnome org>]

commit a44a678d823aba8e2911c0ce367b56e94b814d47
Author: Milan Crha <mcrha redhat com>
Date:   Wed Sep 23 16:07:10 2015 +0200

    source_registry_server_process_file_monitor_event - Correct possible runtime warning
    
    When the source file is not loaded yet, then the corresponding ESource
    object is NULL, but the call calls g_object_unref() on it, which leads
    to a runtime warning, even harmless.

 libebackend/e-source-registry-server.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libebackend/e-source-registry-server.c b/libebackend/e-source-registry-server.c
index 7d34c66..4552c95 100644
--- a/libebackend/e-source-registry-server.c
+++ b/libebackend/e-source-registry-server.c
@@ -500,7 +500,7 @@ source_registry_server_process_file_monitor_event (gpointer key,
                        return;
                }
 
-               g_object_unref (source);
+               g_clear_object (&source);
        }
 
        if (event_type == G_FILE_MONITOR_EVENT_CREATED) {