Merge r9975 from 0.5 branch: fix spurious line-of-fire warning bug.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9977 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on June 14, 2009
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