And fix the last delete_mutation() call again.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10289 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on July 18, 2009
3ES7DIZOFPH4WQMRESMIETNFWZ3QOPPOG26ZXPQBQ6VYOENWLXCQC
Change contents