[gegl] gegl: fix gir docs for gegl_create_chain

[Øyvind Kolås <ok src gnome org>]

commit 7daec74c9d4b90a9001157d727fc98aba9b93592
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Dec 26 22:36:00 2017 +0100

    gegl: fix gir docs for gegl_create_chain

 gegl/gegl-utils.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gegl/gegl-utils.h b/gegl/gegl-utils.h
index a67ff25..12f4790 100644
--- a/gegl/gegl-utils.h
+++ b/gegl/gegl-utils.h
@@ -315,7 +315,7 @@ void gegl_create_chain_argv (char      **ops,
  *
  * Create a node chain from an unparsed commandline string.
  */
-void gegl_create_chain (const char *str,
+void gegl_create_chain (const char *ops,
                         GeglNode   *op_start,
                         GeglNode   *op_end,
                         double      time,