Fixed some data aborts on OS_Args calls
Detail: OS_Args 8 and 9 (ImageStampIS and IOCtl) didn't check that the file handle passed to them was legitimate and hence would cause data aborts as they tried to access non existant structures. Admin: Not tested. Two lines of assembler copied into each function to test whether the file handle is valid from other similar calls. Version 2.56. Tagged as 'FileSwitch-2_56'
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