[Libguestfs] Remove temporary directories created during appliance building along error paths (RHBZ#769680)

[Richard W.M. Jones]

On Fri, Dec 23, 2011 at 07:27:32PM +0800, Wanlong Gao wrote:
> Hi Rich:
> 
> Do you know how to reproduce [it] now?

I do see the same temporary directories left around occasionally.  But
I wasn't able to reliably reproduce the bug, even after trying several
things.

Rich.

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