combine power-or-atom_expr statements into one statement

jedi/evaluate/helpers.py

@@ -88,7 +88,7 @@ def call_of_name(name, cut_own_trailer=False):
             return name
 
     power = par.parent
-    if (tree.is_node(power, 'power') or tree.is_node(power, 'atom_expr')) \
+    if tree.is_node(power, 'power', 'atom_expr') \
             and power.children[0] != name \
             and not (power.children[-2] == '**' and
                      name.start_pos > power.children[-1].start_pos):