INT 21 O - Novell NetWare, Alloy NTNX - RELEASE FILE (FCB)
        AH = CCh
        DS:DX -> FCB (see AH=0Fh)
Return: none
Desc:   unlocks file, but does not remove it from the log table or close it
Note:   this function was added in NetWare 4.0, but was removed some time prior
          to Advanced NetWare 2.15, and is no longer listed in current Novell
          documentation
SeeAlso: AH=CAh,AH=CDh

.