Fix some XPath relative node resets
* src/util/xml.c: The virXPath... function take extra care to preserve the XPath context node (ctxt->node) but in the case of virXPathString and virXPathBoolean they forgot to do this on the error path. This patch fixes this and move all ctxt->node = relnode instuctions just after the xmlXPathEval() to make sure this doesn't happen if this code is modified.
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