PatR 2288b94ae4 fix #H9462 - segfault with levitation boots ...

This is similar to the helm of opposite alignment case fixed some
time ago.  Deferring the setting of foo->known until an item is fully
worn (because it used to get set earlier but gave away information if
the wear operation was interrupted) didn't take into account that foo
might end up Null in various circumstances.  So Boots_on() needs to
validate uarmf before setting uarmf->known in case putting on boots
of levitation while on a sink caused them to come right back off.

I put similar validation into all foo_on() just in case (as far as
I'm aware, only Boots_on() and Helmet_on() actually need that).

2019-11-24 15:33:16 -08:00

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