[gegl] common/warp: fix interpolation reversal

[Alexia Death <alexiade src gnome org>]

commit b44762ba8f768b925d35d8d8519cf2f93fdf4fab
Author: Alexia Death <alexiadeath gmail com>
Date:   Mon Feb 17 20:27:14 2014 +0200

    common/warp: fix interpolation reversal

 operations/common/warp.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/operations/common/warp.c b/operations/common/warp.c
index d00cc91..d1ff0d9 100644
--- a/operations/common/warp.c
+++ b/operations/common/warp.c
@@ -203,7 +203,7 @@ get_stamp_force (GeglChantO *o,
       before = priv->lookup[a];
       after = priv->lookup[a + 1];
 
-      return ratio * before + (1.0 - ratio) * after;
+      return (1.0 - ratio) * before + ratio * after;
     }
 
   return 0.0;