Fix uninitialized error with BUILD_CONFIG=bootstrap-O1

[Alexandre Oliva]

On Jun 11, 2010, Eric Botcazou <ebotcazou@adacore.com> wrote:

>> I suppose -O2 infers that new_ptr can't be NULL because it's
>> dereferenced before, so last will always be set before we exit the loop,
>> but at -O1 it doesn't.
>> 
>> This patch avoids the warning, but perhaps the loop should be turned
>> into a do/while loop to avoid the unnecessary test.

> The most correct version is 'last = NULL_TREE' but then the line overflows.
> So I'd initialize 'last' to NULL_TREE in its declaration; OK with this change.

Thanks, I'm checking this in.

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Alexandre Oliva, freedom fighter    http://FSFLA.org/~lxoliva/
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