Make sure the filters are applied

lib/gitlab/ldap/authentication.rb

@@ -48,15 +48,16 @@ module Gitlab
       end
 
       def user_filter(login)
-        Net::LDAP::Filter.eq(config.uid, login).tap do |filter|
+        filter = Net::LDAP::Filter.eq(config.uid, login)
+
         # Apply LDAP user filter if present
         if config.user_filter.present?
-            Net::LDAP::Filter.join(
+          filter = Net::LDAP::Filter.join(
             filter,
             Net::LDAP::Filter.construct(config.user_filter)
           )
         end
-        end
+        filter
       end
 
       def user