[libgtop] Use glibtop_warn_r instead of fprintf.

[Robert Roth <robertroth src gnome org>]

commit 16f262985dafa27e7ff83f95a04dbb935433eeb6
Author: Benoit Dejean <bdejean gmail com>
Date:   Sun Jun 21 15:13:01 2015 +0200

    Use glibtop_warn_r instead of fprintf.

 lib/read.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/lib/read.c b/lib/read.c
index fb2ca49..477eea3 100644
--- a/lib/read.c
+++ b/lib/read.c
@@ -34,7 +34,7 @@ glibtop_read_l (glibtop *server, size_t size, void *buf)
        glibtop_init_r (&server, 0, 0);
 
 #ifdef LIBGTOP_ENABLE_DEBUG
-       fprintf (stderr, "LIBRARY: really reading %d bytes.\n", (int)size);
+       glibtop_warn_r(server, "LIBRARY: really reading %d bytes.\n", (int)size);
 #endif
 
        fd = server->socket ? server->socket : server->input[0];