[gegl] tools: simplify introspect graph

[Øyvind "pippin" Kolås <ok src gnome org>]

commit f6bfb5f2aff3b45c7aa26c4394562200a035a3f0
Author: Øyvind Kolås <pippin gimp org>
Date:   Fri Jul 20 12:33:42 2018 +0200

    tools: simplify introspect graph
    
    This clears up a warning about target not being regular file
    when building the docs.

 tools/introspect.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
---
diff --git a/tools/introspect.c b/tools/introspect.c
index 218b24c63..44198fcca 100644
--- a/tools/introspect.c
+++ b/tools/introspect.c
@@ -461,10 +461,7 @@ stuff (gint    argc,
     {
       GeglNode  *gegl = g_object_new (GEGL_TYPE_NODE, NULL);
 
-      GeglNode  *save = gegl_node_new_child (gegl,
-                    "operation", "gegl:png-save",
-                    "path", "/dev/null",
-                    NULL);
+      GeglNode  *save = gegl_node_new_child (gegl, "operation", "gegl:nop", NULL);
       GeglNode *crop = gegl_node_new_child (gegl,
        "operation", "gegl:crop",
        "x", 0.0,