[babl] babl: always intialize encoding pointer during format construction

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

commit d1b1ba7ac66455c3de14b685d309620334d47b71
Author: Øyvind Kolås <pippin gimp org>
Date:   Thu May 30 17:50:10 2019 +0200

    babl: always intialize encoding pointer during format construction
    
    This fixes issue #35, we initialize with NULL which will cause
    babl_format_get_encoding to itself call babl_get_name rather.

 babl/babl-format.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/babl/babl-format.c b/babl/babl-format.c
index 5784196..accc15a 100644
--- a/babl/babl-format.c
+++ b/babl/babl-format.c
@@ -127,6 +127,7 @@ format_new (const char      *name,
   babl->format.palette = 0;
 
   babl->format.space = (void*)space;
+  babl->format.encoding = NULL;
 
   return babl;
 }