msi: fix memory leaks (found by Smatch) [try 2]

[Lionel_Debroux]

Fixed stupid mistake pointed by James Hawkins.

2007-12-09  Lionel Debroux <lionel_debroux at yahoo.fr>
        * dlls/msi/database.c:
        msi: fix memory leaks (found by Smatch).

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