[gtk+] tests: Fix logic to detect argument length

[Benjamin Otte <otte src gnome org>]

commit 78582dd5e9cb5cdc0a75a58e1a5c85f4416c8226
Author: Benjamin Otte <otte redhat com>
Date:   Sun Dec 25 06:19:34 2016 +0100

    tests: Fix logic to detect argument length

 tests/rendernode.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tests/rendernode.c b/tests/rendernode.c
index 4388e79..5222b7b 100644
--- a/tests/rendernode.c
+++ b/tests/rendernode.c
@@ -32,7 +32,7 @@ main(int argc, char **argv)
       return 1;
     }
 
-  if (argc != 3 && (argc != 2 && (dump_variant || benchmark)))
+  if (!(argc == 3 || (argc == 2 && (dump_variant || benchmark))))
     {
       g_printerr ("Usage: %s [OPTIONS] NODE-FILE PNG-FILE\n", argv[0]);
       return 1;