[gimp] app: fix gimp_babl_compat_u8_mask_format()

[Ell <ell src gnome org>]

commit 55f963cb2a7a4dcf26443b6f51547ddb0970217f
Author: Ell <ell_se yahoo com>
Date:   Thu Feb 7 11:25:11 2019 -0500

    app: fix gimp_babl_compat_u8_mask_format()
    
    ... post space-invasion

 app/gegl/gimp-babl-compat.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/app/gegl/gimp-babl-compat.c b/app/gegl/gimp-babl-compat.c
index 629ba6d4a3..f310d98e2a 100644
--- a/app/gegl/gimp-babl-compat.c
+++ b/app/gegl/gimp-babl-compat.c
@@ -96,5 +96,6 @@ gimp_babl_compat_u8_mask_format (const Babl *format)
 
   return gimp_babl_format (gimp_babl_format_get_base_type (format),
                            GIMP_PRECISION_U8_LINEAR,
-                           FALSE);
+                           FALSE,
+                           NULL);
 }