[libglnx] dirfd: Fix inverted precondition in previous tmpname commit

[Colin Walters <walters src gnome org>]

commit afe3c3a86178c29ceaa3a5e46397ab2fa97202b3
Author: Colin Walters <walters verbum org>
Date:   Tue May 31 09:29:08 2016 -0400

    dirfd: Fix inverted precondition in previous tmpname commit
    
    I swear I tested it...

 glnx-dirfd.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/glnx-dirfd.c b/glnx-dirfd.c
index 4a071cc..95d7fe1 100644
--- a/glnx-dirfd.c
+++ b/glnx-dirfd.c
@@ -299,7 +299,7 @@ glnx_gen_temp_name (gchar *tmpl)
 
   g_return_if_fail (tmpl != NULL);
   len = strlen (tmpl);
-  g_return_if_fail (len < 6);
+  g_return_if_fail (len >= 6);
 
   XXXXXX = tmpl + (len - 6);