[gegl] workshop: fix babl format in pixel-duster.h

[Øyvind "pippin" Kolås <ok src gnome org>]

commit b1a6e94ed420d8620ec0721f996b0f1d24c7758d
Author: Øyvind Kolås <pippin gimp org>
Date:   Mon Jul 2 20:25:05 2018 +0200

    workshop: fix babl format in pixel-duster.h

 operations/workshop/pixel-duster.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/operations/workshop/pixel-duster.h b/operations/workshop/pixel-duster.h
index 8161e0845..60708b4af 100644
--- a/operations/workshop/pixel-duster.h
+++ b/operations/workshop/pixel-duster.h
@@ -222,7 +222,7 @@ static PixelDuster * pixel_duster_new (GeglBuffer *input,
   ret->in_sampler_yu8 = gegl_buffer_sampler_new (input, babl_format ("Y'aA u8"),
                                                  GEGL_SAMPLER_NEAREST);
   ret->in_sampler_u8 = gegl_buffer_sampler_new (input,
-                                                babl_format ("R'G'B'aA u8"),
+                                                babl_format ("R'G'B'A u8"),
                                                 GEGL_SAMPLER_NEAREST);
   ret->in_sampler_f = gegl_buffer_sampler_new (input,
                                                babl_format ("RGBA float"),