Made sip_subscribe_winfo's return code based on subscription status

darcs-hash:20090115142423-1e3d8-b9a8562db1e2b3871dba4731adf938359f7e1512
Made sip_subscribe_rls's return code based on subscription status

darcs-hash:20090115142510-1e3d8-8c28643858737838ad1c7afa2bc2808fd0100064