=> R0 = 0 (Read sequential pointer)
R1 = internal file handle returned by FSEntry_Open
<= R2 = sequential pointer, or 0 if not applicable
This call is made when FileSwitch needs to know how far into a file the current pointer is. This will only be called for unbuffered files.
On systems with no concept of extents (eg streams) this should not return an error.
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