[sysadmin-bin] fix category check

[Olav Vitters <ovitters src gnome org>]

commit a2037a27952ddbd62b5daeffb445628563e3e148
Author: Olav Vitters <olav vitters nl>
Date:   Sun Aug 3 10:27:49 2014 +0200

    fix category check

 git/validate-doap |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/git/validate-doap b/git/validate-doap
index 1456e46..ff7cfc4 100755
--- a/git/validate-doap
+++ b/git/validate-doap
@@ -78,7 +78,7 @@ for node in nodes:
         if not is_resource(group):
             die("Invalid doap:category property (should be an URL)")
 
-        if group.startswith(GNOME) or group[len(GNOME):] not in valid_groups:
+        if not group.startswith(GNOME) or group[len(GNOME):] not in valid_groups:
             die("doap:category property should be one of: %s" % ",".join(sorted(valid_groups)))
 
     # doap files should have enough fields