vchoi_fork

[svn-r5954] 
Purpose:
     a bug fix
Description:
    When a file is opened for a second time, file close degree is supposed to
    be either the same as the first open, or default as the first open is also
    default.
Platforms tested:
    Linux 2.2(eirene), Solaris 2.7(arabica), IRIX64 6.5(modi4)