* Close file on invalid range. * Close on seek error Signed-off-by: Andrew Thornton <[email protected]> * Moved 'Seek' into server. * io.ReadSeekCloser is only available in Go 1.16 Co-authored-by: Andrew Thornton <[email protected]> Co-authored-by: Lauris BH <[email protected]> Co-authored-by: Lunny Xiao <[email protected]>