virNodeDevCapScsiHostParseXML: avoid an unconditional leak

* src/conf/node_device_conf.c (virNodeDevCapScsiHostParseXML):
Free the "nodes" buffer allocated by virXPathNodeSet.

src/conf/node_device_conf.c

@@ -797,6 +797,7 @@ virNodeDevCapScsiHostParseXML(xmlXPathContextPtr ctxt,
 out:
     VIR_FREE(type);
     ctxt->node = orignode;
+    VIR_FREE(nodes);
     return ret;
 }