Merge branch 'maint'

A couple of overflow bugs and a aslignment issue, all detected by ubsan. Plus
two unrelated old bugs.

* maint:
  client: Fix lsatt completer.
  playlist: Do not update score if no playlist is open.
  Avoid member access within misaligned address for ancillary data buffer.
  mood.c: Avoid overflow in update_quadratic_deviation().
  mood.c: Avoid integer underflow.
  mood.c: Avoid integer overflow.