cabinet: fully initialize structs in FCICreate() and FCIAddFile()

[Dan Kegel]

The code seems to have missed initializing a field
in two structs, which causes warnings in Valgrind.

Rather than hunt it down precisely, I applied
the old "memset the struct to zero when allocating"
meme, which in some circles is considered the "right"
way to avoid this kind of problem.  (I halfway expect
Alexandre to say "don't be so lazy", but it's worth a try.)

-- 
Wine for Windows ISVs: http://kegel.com/wine/isv
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