[libvirt] [PATCH] util: fix potential segfault

[Peter Krempa]

On Wed, Apr 12, 2017 at 17:38:06 +0800, Wang King wrote:
> virBufferCurrentContent might be get a NULL string, and then without checking it,
> this can cause a segfault as strlen expects a string != NULL. Use virBufferCheckError
> to check error before calling strlen.
> ---

I've already pushed the previous version with some changes to the commit
message.
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