[gegl] panorama-projection: opt out of auto-threading

[Øyvind Kolås <ok src gnome org>]

commit 8fa5c9bef7b07b81d6f92ca2b545e50b49fa4648
Author: Øyvind Kolås <pippin gimp org>
Date:   Mon Apr 9 14:28:35 2018 +0200

    panorama-projection: opt out of auto-threading
    
    valgrind is reporting bad acccesses

 operations/common/panorama-projection.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/operations/common/panorama-projection.c b/operations/common/panorama-projection.c
index 5600355..13ab7ab 100644
--- a/operations/common/panorama-projection.c
+++ b/operations/common/panorama-projection.c
@@ -544,6 +544,7 @@ gegl_op_class_init (GeglOpClass *klass)
 
   filter_class->process = process;
   operation_class->prepare = prepare;
+  operation_class->threaded = FALSE;
   operation_class->get_bounding_box = get_bounding_box;
   operation_class->get_required_for_output = get_required_for_output;