Avoid additional fish in portal_sewer_entry_d.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10149 c06c8d41-db1a-0410-9941-cceddc491573

Created by  evktalo  on July 11, 2009
CV3KEYIOCM32J4HDWPG4PEXZ72YMVZIAW7OADNF2BWK5JAIGUTKQC
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