[babl] babl: fix naive CMYK reference to do 100% pullout

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

commit f555c0eea07edce72076ed96619cd53aa8949ea4
Author: Øyvind Kolås <pippin gimp org>
Date:   Sun May 3 12:12:52 2020 +0200

    babl: fix naive CMYK reference to do 100% pullout

 babl/babl-fish-reference.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/babl/babl-fish-reference.c b/babl/babl-fish-reference.c
index 4c2e3150d..f641a2150 100644
--- a/babl/babl-fish-reference.c
+++ b/babl/babl-fish-reference.c
@@ -918,7 +918,7 @@ babl_fish_reference_process_double (const Babl *babl,
       for (i = 0; i < n; i++)
       {
         /* A very naive conversion - but it is usable */
-        double key=0.0;
+        double key=1.0;
         cmyka[i * 5 + 0] = 1.0 - rgba[i * 4 + 0];
         cmyka[i * 5 + 1] = 1.0 - rgba[i * 4 + 1];
         cmyka[i * 5 + 2] = 1.0 - rgba[i * 4 + 2];