hdf5_msb

If we're processing the EOT queue when we *enter* a function, use
HGOTO_ERROR() instead of HDONE_ERROR() so that we jump to the `done`
label right away.  This ought to fix the problem Vailin was seeing,
where the library left H5F_vfd_swmr_reader_end_of_tick() prematurely for
seemingly no reason.