bad operator in ldap "sync_user" method

Hello,

There is a little mistake here :
http://git.moodle.org/gw?p=moodle.git;a=blob;f=auth/ldap/auth.php;h=fed0bae7aadf466717deba63f921425e3f63097b;hb=HEAD#l714

Operator should be != or variables must be casted (because one is int and other is string).

Currently this condition always return true. Fortunately there is no bad effect, just a resource/time waste.

Thanks.