player's maximum MP is zero.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3287 c06c8d41-db1a-0410-9941-cceddc491573
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int disp = width * val / max_val;
int disp = (max_val == 0) ? 0 : width * val / max_val;