msi: fix memory leaks (found by Smatch).

[Lionel_Debroux]

"msi_build_insertsql_data" and "MSI_DatabaseImport" in
dlls/msi/database.c get flagged by Michael Stefaniuc's unfree-wine.pl
script.

It looks there are more leaks than unfree-wine.pl reports, due to
constructs of the form
ptr = msi_realloc(ptr, size);
Fixed those as well.

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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