=> R0 = 11 (Stream closed)
R1 = device driver's handle
R2 = 0 if closed for reception (else close for transmission)
R3 = file handle for stream
R4 = DeviceFS stream handle, as passed to device driver on installation
<= All registers preserved
DeviceFS issued this call when a stream is closed. It serves as a broadcast, and all registers should be preserved.
This call is never issued under RISC OS 2.
See PRM 1, page 192
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