[gegl] gegl-serialize: prevent possible infinite loop

[Øyvind Kolås <ok src gnome org>]

commit c944df8b4be60959d74d65105060feb5e42fea58
Author: Øyvind Kolås <pippin gimp org>
Date:   Sun Jun 18 23:59:39 2017 +0200

    gegl-serialize: prevent possible infinite loop
    
    if remove_in_betweens was passed two unconnected nodes - it would never finish.

 gegl/gegl-serialize.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gegl/gegl-serialize.c b/gegl/gegl-serialize.c
index 283951c..bae2868 100644
--- a/gegl/gegl-serialize.c
+++ b/gegl/gegl-serialize.c
@@ -46,6 +46,8 @@ remove_in_betweens (GeglNode *nop_raw,
       int count = gegl_node_get_consumers (iter, "output", &nodes, NULL);
       if (count)
         iter = nodes[0];
+      else
+        iter = NULL;
       g_free (nodes);
       if (iter && iter != nop_transformed)
         collect = g_list_append (collect, iter);