PatR a03d20d7ab fix Bell of Opening segfault ...

Noticed on nethack.alt.org; the Bell of Opening could trigger a
segfault if applied near a trap door or bear trap (and a few others)
that had no monster at the trap location.  Reproducible if done
while mounted; {open,close}{fall,hold}ingtrap() would try to access
monst->mx and monst->my of a Null monst pointer if given one when
u.usteed was non-Null.

2017-03-17 03:20:11 -07:00

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