minor tweak to cyrus 2.1.8

[Chris Gilbert]

Hi,

Just been fiddling with cyrus 2.1.8, and for numerous reasons ended up with NetBSD telling me that free was being given a junk pointer, a bit of debugging later turns out that the error cases for create_db, turns out that the error cases caused a bad db->fname to be freed, it just needed initialising to NULL.

Please can someone check the attached patch.  Should I have entered this via http://bugzilla.andrew.cmu.edu/ ?

Cheers,
Chris

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