Ticket #306 - void function cannot return value
    
    Bug Description:  slapi_attr_value_normalize() was trying to return
                       slapi_attr_value_normalize_ext().
    
    Fix Description:  Instead of returning the function, we just call it.
                      Currently this function is not being used by the DS,
                      but it should be fixed.
    
    https://fedorahosted.org/389/ticket/306
    (cherry picked from commit 3d623c07a380d497e0566d0dd6496667016922a7)