Added bounds check for berserk monsters looking for a target.

Dropped berserk duration again.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1978 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on August 7, 2007
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