[gtk/wip/chergert/glproto] we bumped to 21

[Christian Hergert <chergert src gnome org>]

commit 6bfa38044e885a1fee67d926fbc181cdc36af0d9
Author: Christian Hergert <chergert redhat com>
Date:   Wed Feb 17 07:49:06 2021 -0800

    we bumped to 21

 gsk/next/gskgluniformstate.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/gsk/next/gskgluniformstate.c b/gsk/next/gskgluniformstate.c
index 57dd1b1a0e..d87a0070a8 100644
--- a/gsk/next/gskgluniformstate.c
+++ b/gsk/next/gskgluniformstate.c
@@ -152,7 +152,8 @@ setup_info:
                                 uniform_sizes[format] * MAX (1, array_count),
                                 &offset);
 
-  g_assert (offset < (1 << 20)); /* we have 20 bits for offset */
+  /* we have 21 bits for offset */
+  g_assert (offset < (1 << 21));
 
   info->info.format = format;
   info->info.offset = offset;