Don't return failure when trying to delete a non-existent node.

Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>

tools/python/xen/lowlevel/xs/xs.c

@@ -264,7 +264,7 @@ static PyObject *xspy_rm(PyObject *self, PyObject *args, PyObject *kwds)
     Py_BEGIN_ALLOW_THREADS
     xsval = xs_rm(xh, path);
     Py_END_ALLOW_THREADS
-    if (!xsval) {
+    if (!xsval && errno != ENOENT) {
         PyErr_SetFromErrno(PyExc_RuntimeError);
         goto exit;
     }