interface: move parsing of bridge attributes into appropriate function

For some reason the bridge stp mode and delay were put directly into
the "bridge" case of the switch in virInterfaceDefParseXML(), although
they are inside the <bridge> element, and so should be parsed in the
function created for that purpose - virInterfaceBridgeDefFormat().

src/conf/interface_conf.c

@@ -487,11 +487,27 @@ virInterfaceDefParseBridge(virInterfaceDefPtr def,
     xmlNodePtr *interfaces = NULL;
     xmlNodePtr bridge;
     virInterfaceDefPtr itf;
+    char *tmp = NULL;
     int nbItf;
     size_t i;
     int ret = 0;
 
     bridge = ctxt->node;
+    def->data.bridge.stp = -1;
+    if ((tmp = virXMLPropString(bridge, "stp"))) {
+        if (STREQ(tmp, "on")) {
+            def->data.bridge.stp = 1;
+        } else if (STREQ(tmp, "off")) {
+            def->data.bridge.stp = 0;
+        } else {
+            virReportError(VIR_ERR_XML_ERROR,
+                           _("bridge interface stp should be on or off got %s"),
+                           tmp);
+            goto error;
+        }
+    }
+    def->data.bridge.delay = virXMLPropString(bridge, "delay");
+
     nbItf = virXPathNodeSet("./interface", ctxt, &interfaces);
     if (nbItf < 0) {
         ret = -1;
@@ -517,6 +533,7 @@ virInterfaceDefParseBridge(virInterfaceDefPtr def,
     }
 
  error:
+    VIR_FREE(tmp);
     VIR_FREE(interfaces);
     ctxt->node = bridge;
     return ret;
@@ -751,23 +768,6 @@ virInterfaceDefParseXML(xmlXPathContextPtr ctxt, int parentIfType)
                                "%s", _("bridge interface misses the bridge element"));
                 goto error;
             }
-            tmp = virXMLPropString(bridge, "stp");
-            def->data.bridge.stp = -1;
-            if (tmp != NULL) {
-                if (STREQ(tmp, "on")) {
-                    def->data.bridge.stp = 1;
-                } else if (STREQ(tmp, "off")) {
-                    def->data.bridge.stp = 0;
-                } else {
-                    virReportError(VIR_ERR_XML_ERROR,
-                                   _("bridge interface stp should be on or off got %s"),
-                                   tmp);
-                    VIR_FREE(tmp);
-                    goto error;
-                }
-                VIR_FREE(tmp);
-            }
-            def->data.bridge.delay = virXMLPropString(bridge, "delay");
             ctxt->node = bridge;
             if (virInterfaceDefParseBridge(def, ctxt) < 0)
                 goto error;