Fixed some melee_attack::chaos_affects_defender() bugs.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7738 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on December 3, 2008
43ZYZLF7JFSCKTLQMBYIHNGGDMN3OBDX4X4PLXLIUFD5DPYSDCXQC
Change contents