move adt_tree.c (virtual registry tree) to new talloc()

[Gerald (Jerry) Carter]

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Folks,

Here's a small patch to move the ADT which forms the base for
our virtual registry tree to a talloc based structure.  Simple
patch but review welcome.

http://samba.org/~jerry/patches/adt_tree_talloc_v1.patch

The key parts of the removal of the unused free_func
tree node field and the replacement of the recursive
destroy() function with a single TALLOC_FREE.  This of course
implies that any void* stored in the tree need to be either
(a) allocated from the tree's own ctx or (b) are static
variables such as the REGISTRY_HOOK reg_hooks[] table
in reg_frontend.c





cheers, jerry
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