[Libvir] [PATCH] Readd buffer errors & some cleanups

[Richard W.M. Jones]

This readds some error checking of the returns from virBuffer* 
functions, removes need for is_blank (a _GNU_SOURCE extension), and a 
couple of other very minor cleanups.

Rich.

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Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/
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