fhandler::close patch

[Conrad Scott]

I'm starting to sort out my sandbox.  Here's a patch for close(2)
to return the error code from fhandler::close rather than being
hardcoded to zero.  I've also patched fhandler_registry::close as
that was also discarding an error value.  Otherwise, all the other
fhandler::close() routines seem to be returning reasonable values
(on a brief read through).

Enjoy.

// Conrad

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