fix suicidal panic

fix suicidal panic

     Some post-3.4.3 code in done() cleans up thrownobj and kickobj to
plug a potential memory leak (unnoticeable one since the game is over),
but they have to be free objects rather than on any list.  toss_up() was
leaving thrownobj defined after putting the thrown object on the floor,
leading to "obj not free" panic from dealloc_obj() if threw you an object
upward and it dealt fatal damage when it fell back down.  (For non-fatal
damage, toss_up()'s caller cleaned things up later.)