conf: fix parsing of NUMA settings in VM status XML

Commit 5bba61fd changed the XPath strings to be absolute when parsing
the VM NUMA configuration. Unfortunately the <domain> element is not a
top level element when parsing the domain status XML thus the absolute
XPath string doesn't match.

Use the relative string so that the <numa> settings are not lost.
Signed-off-by: NLuyao Huang <lhuang@redhat.com>

src/conf/numa_conf.c

@@ -663,10 +663,10 @@ virDomainNumaDefCPUParseXML(virDomainNumaPtr def,
     int ret = -1;
 
     /* check if NUMA definition is present */
-    if (!virXPathNode("/domain/cpu/numa[1]", ctxt))
+    if (!virXPathNode("./cpu/numa[1]", ctxt))
         return 0;
 
-    if ((n = virXPathNodeSet("/domain/cpu/numa[1]/cell", ctxt, &nodes)) <= 0) {
+    if ((n = virXPathNodeSet("./cpu/numa[1]/cell", ctxt, &nodes)) <= 0) {
         virReportError(VIR_ERR_XML_ERROR, "%s",
                        _("NUMA topology defined without NUMA cells"));
         goto cleanup;