[gupnp-tools] upload: Fix critical on shutdown

[Jens Georg <jensgeorg src gnome org>]

commit 1a1bf03723d2383fc0affb6d94565038f83b600e
Author: Jens Georg <mail jensge org>
Date:   Wed Dec 31 01:34:21 2014 +0100

    upload: Fix critical on shutdown
    
    Signed-off-by: Jens Georg <mail jensge org>

 src/upload/main.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/upload/main.c b/src/upload/main.c
index ca6a816..a713def 100644
--- a/src/upload/main.c
+++ b/src/upload/main.c
@@ -123,7 +123,8 @@ target_cds_found (GUPnPServiceProxy *target_cds_proxy)
 void
 application_exit (void)
 {
-        g_main_loop_quit (main_loop);
+        if (main_loop != NULL)
+                g_main_loop_quit (main_loop);
 }
 
 gint
@@ -190,7 +191,7 @@ main (gint   argc,
         g_main_loop_run (main_loop);
 
         /* Clean-up */
-        g_main_loop_unref (main_loop);
+        g_clear_pointer (&main_loop, g_main_loop_unref);
         deinit_control_point ();
         g_object_unref (upnp_context);
         g_option_context_free (context);