Prevent possible null deref in genericMovedIntoRoom
Prevent possible null deref in genericMovedIntoRoom

It's hard to puzzle out what's going on in this crazy function, but there's
definitely a deref after a delete.

sneezymud/sneezymud,sneezymud/sneezymud,sneezymud/sneezymud,sneezymud/sneezymud,sneezymud/sneezymud,sneezymud/sneezymud,sneezymud/sneezymud