[gnome-software] trivial: Fix a warning when launching the 2nd instance

[Richard Hughes <rhughes src gnome org>]

commit 75b78269efdf5e1c60b7d8249b4e66252f706bd4
Author: Richard Hughes <richard hughsie com>
Date:   Thu Apr 20 19:49:02 2017 +0100

    trivial: Fix a warning when launching the 2nd instance

 lib/gs-debug.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/lib/gs-debug.c b/lib/gs-debug.c
index dd825e9..3b61f6c 100644
--- a/lib/gs-debug.c
+++ b/lib/gs-debug.c
@@ -167,7 +167,9 @@ gs_debug_init (GsDebug *debug)
        g_mutex_init (&debug->mutex);
        debug->use_time = g_getenv ("GS_DEBUG_NO_TIME") == NULL;
        debug->use_color = (isatty (fileno (stdout)) == 1);
-       g_log_set_writer_func (gs_debug_log_writer, debug, NULL);
+       g_log_set_writer_func (gs_debug_log_writer,
+                              g_object_ref (debug),
+                              (GDestroyNotify) g_object_unref);
 }
 
 GsDebug *