GN_Wcl, Close wildcard handle

Register parameters

RST 20H, DEFW $5409
     IX = wildcard handle
OUT, if call successful:
     Fc = 0
     IX = 0
OUT, if call failed:
     Fc = 1
     A = error code:
          RC_HAND ($08), bad handle

Registers changed after return:
     ...C..HL/..IY same
     AFB.DE../IX.. different 

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

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