fuse.EBADF not defined

[DamonBlais]

As per the documentation on close(2) and close(3), when a file handle either does not exist or has gone stale, or has already been closed; this error should be returned. Currently, one must return EIO or EINVAL as you have not given us the proper options.

I could not find an error code matching syscall.EBADF defined in this package.

It should be defined.

[jacobsa]

Please don't open one issue per missing constant -- that's a little bit excessive.