Fix sanity check bug in choose_random_nearby_monster(), and also in

beogh_followers_abandon_you(), which is based on the same code.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3699 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on March 17, 2008
C6LQVIY4ZBCWW4OWH7YS6SIHAUCAIS2EB7SJHSTNT3OLTLCEG3CQC
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