[Ada] Default-initialize Nodes component

[Arnaud Charlet <charlet at adacore dot com>]

When manipulating bounded tree-based container objects, that do not otherwise
have any explicit initialization expression, the compiler would emit a warning
about the object not being initialized, because the Nodes component of the tree
type had not been given an initialization expression.

This warning is a false positive, because the logical state of the object is
empty, and other components of the tree record type are initialized, in a
manner that establishes the representation invariant of the object.

In order to eliminate the warning, the Nodes component of the tree type was
given an initialization expression.

Tested on x86_64-pc-linux-gnu, committed on trunk

2011-08-31  Matthew Heaney  <heaney@adacore.com>

	* a-crbltr.ads (Tree_Type): Default-initialize the Nodes component.

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