do_zap() dereferenced a struct object pointer while ignoring the result
of a NULL check. XRogue had the same problem, though triggering it was
unlikely, since XRogue does not include a magic missile spell.
Reported by John Harris of @Play.
There should only be two changes in behavior:
arogue7/fight.c, arogue7/fight.c: a to-hit bonus is now correctly
applied to characters who are not monks instead of monks who are not
empty-handed.
urogue/fight.c: fixed an interaction with the "debug" macro that could
cause the wrong message to be displayed.
Some calls to runto() were given a pointer to the player struct instead
of to the player's coordinates. A call to death() was passed a pointer
to a monster instead of the monster's type number.
