[gtk/wip/chergert/glproto] fix missing comma

[Christian Hergert <chergert src gnome org>]

commit 0998974709e028077b6902eed9e92c285e0966d5
Author: Christian Hergert <chergert redhat com>
Date:   Mon Feb 1 22:16:09 2021 -0800

    fix missing comma

 gsk/next/gskglcommandqueue.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gsk/next/gskglcommandqueue.c b/gsk/next/gskglcommandqueue.c
index ae07055acf..a2e29bef70 100644
--- a/gsk/next/gskglcommandqueue.c
+++ b/gsk/next/gskglcommandqueue.c
@@ -225,7 +225,7 @@ print_uniform (GskGLUniformFormat format,
       graphene_matrix_to_float (&data->matrix[0], mat);
       g_printerr ("matrix<");
       for (guint i = 0; i < G_N_ELEMENTS (mat)-1; i++)
-        g_printerr ("%f", mat[i]);
+        g_printerr ("%f,", mat[i]);
       g_printerr ("%f>", mat[G_N_ELEMENTS (mat)-1]);
       break;
     }