[gegl] gegl-dot: fix memory leak

[Michael Murà <mmure src gnome org>]

commit 0022f982454a62a8e569060850ec777f9069bf1b
Author: Michael Murà <mure michael gmail com>
Date:   Tue Sep 11 04:17:04 2012 +0900

    gegl-dot: fix memory leak

 gegl/gegl-dot.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gegl/gegl-dot.c b/gegl/gegl-dot.c
index e825b4e..2b43ac5 100644
--- a/gegl/gegl-dot.c
+++ b/gegl/gegl-dot.c
@@ -350,4 +350,5 @@ gegl_dot_node_to_png (GeglNode    *node,
   dot_cmd = g_strdup_printf ("dot -o %s -Tpng %s", png_path, dot_filename);
   if (system (dot_cmd) == -1)
     g_warning ("Error executing GraphViz dot program");
+  g_free (dot_cmd);
 }