sizeof(), which is unsigned.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2118 c06c8d41-db1a-0410-9941-cceddc491573
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for (int i = 0; i < ARRAYSIZE(safe_to_overwrite); ++i)
for (int i = 0; i < (int) ARRAYSIZE(safe_to_overwrite); ++i)