[gegl] transform: fix gegl_transform_prepare() after last commit

[N/A <ell src gnome org>]

commit 70d290a157bc66c707789eebd552fcb4b4a1191b
Author: Ell <ell_se yahoo com>
Date:   Thu Mar 22 16:59:43 2018 -0400

    transform: fix gegl_transform_prepare() after last commit

 operations/transform/transform-core.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/operations/transform/transform-core.c b/operations/transform/transform-core.c
index 42a33c8..8d439dd 100644
--- a/operations/transform/transform-core.c
+++ b/operations/transform/transform-core.c
@@ -151,7 +151,7 @@ gegl_transform_prepare (GeglOperation *operation)
   GeglMatrix3  matrix;
   OpTransform *transform = (OpTransform *) operation;
 
-  gegl_transform_create_composite_matrix (transform, &matrix, NULL);
+  gegl_transform_create_composite_matrix (transform, &matrix);
 
   /* The identity matrix is also a fast translate matrix. */
   if (gegl_transform_is_intermediate_node (transform) ||