fix, PEBKAC, reassign qio ctx upon handle_close()

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
fix, PEBKAC, unset ctx slot of qio upon handle_data() error

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'fix/umpfd'

* fix/umpfd:
  fix, PEBKAC, unset ctx slot of qio upon handle_data() error
  fix, PEBKAC, reassign qio ctx upon handle_close()