[gegl] operations: motion-blur-zoom: use whole region's height to determine y center

[Thomas Manni <tmanni src gnome org>]

commit b9894310cf524c6a727376cbaeb8596ef797bdbb
Author: Thomas Manni <thomas manni free fr>
Date:   Mon Dec 15 12:47:54 2014 +0100

    operations: motion-blur-zoom: use whole region's height to determine y center

 operations/common/motion-blur-zoom.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/operations/common/motion-blur-zoom.c b/operations/common/motion-blur-zoom.c
index cb588f4..436270b 100644
--- a/operations/common/motion-blur-zoom.c
+++ b/operations/common/motion-blur-zoom.c
@@ -138,7 +138,7 @@ process (GeglOperation       *operation,
   center_x = gegl_coordinate_relative_to_pixel (
                 o->center_x, whole_region->width);
   center_y = gegl_coordinate_relative_to_pixel (
-                o->center_y, whole_region->width);
+                o->center_y, whole_region->height);
 
   src_rect = *roi;
   src_rect.x -= op_area->left;