Fixed syntax error.

lib/sso.rb

@@ -59,7 +59,7 @@ returns
       # auth not ok
       next if !user_auth
 
-      Rails.logger.info "Authentication against #{config_item[:adapter]} for user #{user.login} ok."
+      Rails.logger.info "Authentication against #{config_item[:adapter]} for user #{user_auth.login} ok."
 
       # remember last login date
       user_auth.update_last_login