[gtk/matthiasc/for-master] Fix the testupload test

[Matthias Clasen <matthiasc src gnome org>]

commit 643a91bd08f3d304f2694abe6227a221acb42f38
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Sep 10 08:05:29 2021 -0400

    Fix the testupload test
    
    This can only ever have worked by accident.

 tests/testupload.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/tests/testupload.c b/tests/testupload.c
index 93cacfe696..571f40ff8f 100644
--- a/tests/testupload.c
+++ b/tests/testupload.c
@@ -3,7 +3,7 @@
 static const char *format_name[] = {
   "BGRAp", "ARGBp", "RGBAp",
   "BGRA", "ARGB", "RGBA", "ABGR",
-  "RGB", "BGR",
+  "RGB", "BGR", NULL
 };
 
 static const char *