[gimp] app: gimp_channel_new_from_alpha(): use gimp_drawable_get_component_format()

[Michael Natterer <mitch src gnome org>]

commit e424b9ebbdb581014a9ab300b2e2f959d3da3a20
Author: Michael Natterer <mitch gimp org>
Date:   Mon Jun 2 08:12:48 2014 +0200

    app: gimp_channel_new_from_alpha(): use gimp_drawable_get_component_format()

 app/core/gimpchannel.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/app/core/gimpchannel.c b/app/core/gimpchannel.c
index a504112..0e70915 100644
--- a/app/core/gimpchannel.c
+++ b/app/core/gimpchannel.c
@@ -1604,8 +1604,8 @@ gimp_channel_new_from_alpha (GimpImage     *image,
   dest_buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (channel));
 
   gegl_buffer_set_format (dest_buffer,
-                          gimp_image_get_component_format (image,
-                                                           GIMP_ALPHA_CHANNEL));
+                          gimp_drawable_get_component_format (drawable,
+                                                              GIMP_ALPHA_CHANNEL));
   gegl_buffer_copy (gimp_drawable_get_buffer (drawable), NULL,
                     dest_buffer, NULL);
   gegl_buffer_set_format (dest_buffer, NULL);