In _mons_open_door(), make sure adj is initialized when the secret door

in question isn't a large one.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3833 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on March 23, 2008
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