Use gdbpy_ref in invoke_match_method

Change invoke_match_method to use gdbpy_ref.
I neglected to convert this function in my earlier series.

2017-01-10  Tom Tromey  <tom@tromey.com>

	* python/py-xmethods.c (invoke_match_method): Use
	gdbpy_ref.

gdb/ChangeLog

@@ -1,3 +1,8 @@
+2017-01-10  Tom Tromey  <tom@tromey.com>
+
+	* python/py-xmethods.c (invoke_match_method): Use
+	gdbpy_ref.
+
 2017-01-10  Tom Tromey  <tom@tromey.com>
 
 	* python/py-xmethods.c (gdbpy_get_matching_xmethod_workers): use

gdb/python/py-xmethods.c

@@ -94,59 +94,33 @@ static PyObject *
 invoke_match_method (PyObject *matcher, PyObject *py_obj_type,
 		     const char *xmethod_name)
 {
-  PyObject *py_xmethod_name;
-  PyObject *match_method, *enabled_field, *match_result;
-  struct cleanup *cleanups;
   int enabled;
 
-  cleanups = make_cleanup (null_cleanup, NULL);
+  gdbpy_ref enabled_field (PyObject_GetAttrString (matcher,
-
+						   enabled_field_name));
-  enabled_field = PyObject_GetAttrString (matcher, enabled_field_name);
   if (enabled_field == NULL)
-    {
+    return NULL;
-      do_cleanups (cleanups);
-      return NULL;
-    }
-  make_cleanup_py_decref (enabled_field);
 
-  enabled = PyObject_IsTrue (enabled_field);
+  enabled = PyObject_IsTrue (enabled_field.get ());
   if (enabled == -1)
-    {
+    return NULL;
-      do_cleanups (cleanups);
-      return NULL;
-    }
   if (enabled == 0)
     {
       /* Return 'None' if the matcher is not enabled.  */
-      do_cleanups (cleanups);
       Py_RETURN_NONE;
     }
 
-  match_method = PyObject_GetAttrString (matcher, match_method_name);
+  gdbpy_ref match_method (PyObject_GetAttrString (matcher, match_method_name));
   if (match_method == NULL)
-    {
+    return NULL;
-      do_cleanups (cleanups);
-      return NULL;
-    }
-  make_cleanup_py_decref (match_method);
 
-  py_xmethod_name = PyString_FromString (xmethod_name);
+  gdbpy_ref py_xmethod_name (PyString_FromString (xmethod_name));
   if (py_xmethod_name == NULL)
-    {
+    return NULL;
-      do_cleanups (cleanups);
-      return NULL;
-    }
-  make_cleanup_py_decref (py_xmethod_name);
 
-  match_result = PyObject_CallMethodObjArgs (matcher,
+  return PyObject_CallMethodObjArgs (matcher, py_match_method_name,
-					     py_match_method_name,
+				     py_obj_type, py_xmethod_name.get (),
-					     py_obj_type,
+				     NULL);
-					     py_xmethod_name,
-					     NULL);
-
-  do_cleanups (cleanups);
-
-  return match_result;
 }
 
 /* Implementation of get_matching_xmethod_workers for Python.  */