[grilo] build: fix build due wrong format in debug

[Dominique Leuenberger <dleuen src gnome org>]

commit 3a6268f60712aafd2f007426e5d646c8ce237657
Author: Dominique Leuenberger <dimstar opensuse org>
Date:   Sat Sep 10 23:51:38 2016 +0200

    build: fix build due wrong format in debug
    
    Introduced in commit f3ccf55

 tests/lib-net.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tests/lib-net.c b/tests/lib-net.c
index d1eb73e..0608083 100644
--- a/tests/lib-net.c
+++ b/tests/lib-net.c
@@ -86,7 +86,7 @@ soup_server_throttling_cb (SoupServer *server,
                            SoupClientContext *client,
                            gpointer user_data)
 {
-  gchar *response = g_strdup_printf ("%lu", g_get_monotonic_time());
+  gchar *response = g_strdup_printf ("%" G_GINT64_FORMAT, g_get_monotonic_time());
 
   soup_message_set_response (message, "text/plain", SOUP_MEMORY_TAKE, response, strlen(response));
   soup_message_set_status (message, SOUP_STATUS_OK);