[PATCH] shadow_copy2: revert unnecessary talloc_zero_array initialization

[Michael Adam]

Hi,

after a discussion with Volker, I added a unnecessary
talloc_zero_array initialization when working on the
shadow copy module. Since this expensive, I revert it
and  add a comment describing this pitfall (as a separate
commit to give the option not to pick this comment :-).

comments / review / push appreciated!

Cheers - Michael

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