610281 - fix coverity Defect Type: Control flow issues
    
    https://bugzilla.redhat.com/show_bug.cgi?id=610281
    
    11813 DEADCODE Triaged Unassigned Bug Minor Fix Required
    send_dirsync_search() ds/ldap/servers/plugins/replication/windows_connection.c
    
    Comment:
    op_string points to a static string:
    731 op_string = "search";
    We don't need to check op_string in slapi_log_error.