GN_Wcl, close wildcard handle

RST 20H, DEFW $5409

IN:

     IX = wildcard handle

     Fc = 0
     IX = 0

     Fc = 1
     A = error code:
          RC_HAND ($08), bad handle

     ...C..HL/..IY same
     AFB.DE../IX.. different

Bugs:
 

Related calls:

GN_Esa, read & write to filename segments
GN_Fcm, compress a filename
GN_Fex, expand a filename
GN_Opw, Open wildcard handler
GN_Pfs, parse filename segment
GN_Prs, parse filename
GN_Wfn, fetch next match for wildcard string (handle)
GN_Wsm, match filename segment to wildcard string