[Libvir] Avoid leak upon failed realloc

[Daniel P. Berrange]

On Fri, Jun 22, 2007 at 11:55:22AM +0200, Jim Meyering wrote:
> This matters only if/when this realloc call fails.  And then, only in
> the small way that with this patch, there's a slightly better chance of
> recovering from the low-memory condition.

Looks good, but please don't apply this to CVS. I'll make the equivalent
fix in my QEMU patch series.

/me doesn't want to re-diff a series of 20 patches again :-)

Dan.
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