Fix bug #2517821: if a trap killed a monster and then tried to drop ammo it

would get a position of (0, 0) from the dead monster and place it there, leading to a debug_item_scan() warning.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8626 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 20, 2009
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