[gegl] Fixed error in array subscript that affected GIMP's perspective transform.

[Kevin Cozens <kcozens src gnome org>]

commit 2a8f9e567f8fb7368bb80a10273228f51e60bad6
Author: Kevin Cozens <kcozens svn gnome org>
Date:   Wed Mar 21 16:24:36 2012 -0400

    Fixed error in array subscript that affected GIMP's perspective transform.

 operations/affine/affine.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/operations/affine/affine.c b/operations/affine/affine.c
index 61c2f04..1997199 100644
--- a/operations/affine/affine.c
+++ b/operations/affine/affine.c
@@ -699,7 +699,7 @@ affine_generic (GeglBuffer  *dest,
       /* correct rounding on e.g. negative scaling (is this sound?) */
       if (inverse.coeff [0][0] < 0.)  u_start -= .001;
       if (inverse.coeff [1][1] < 0.)  v_start -= .001;
-      if (inverse.coeff [2][1] < 0.)  w_start -= .001;
+      if (inverse.coeff [2][2] < 0.)  w_start -= .001;
 
       for (dest_ptr = dest_buf, y = roi->height; y--;)
         {