qemudNetworkIfaceConnect: remove dead store

* src/qemu/qemu_conf.c (qemudNetworkIfaceConnect): Remove extraneous
virSaveLastError call, whose result was unused.

src/qemu/qemu_conf.c

@@ -1522,7 +1522,6 @@ qemudNetworkIfaceConnect(virConnectPtr conn,
         virSetError(errobj);
         virFreeError(errobj);
 
-        errobj = virSaveLastError();
         if (fail)
             return -1;