Stop infer_call_result from being improperly called in tests

The calls previously implied that the
result is being called from inside itself

astroid/scoped_nodes.py

@@ -1526,7 +1526,7 @@ class FunctionDef(node_classes.Statement, Lambda):
         return next(self.nodes_of_class(yield_nodes,
                                         skip_klass=(FunctionDef, Lambda)), False)
-    def infer_call_result(self, caller, context=None):
+    def infer_call_result(self, caller=None, context=None):
         """Infer what the function returns when called.
         :returns: What the function returns.

astroid/tests/unittest_scoped_nodes.py

@@ -1517,7 +1517,7 @@ class ClassNodeTest(ModuleLoader, unittest.TestCase):
         def test(): #@
             yield
         """)
-        result = next(func.infer_call_result(func))
+        result = next(func.infer_call_result())
         self.assertIsInstance(result, Generator)
         self.assertEqual(result.parent, func)

astroid/tests/unittest_transforms.py

@@ -146,7 +146,7 @@ class TestTransforms(unittest.TestCase):
                 for decorator in node.decorators.nodes:
                     inferred = next(decorator.infer())
                     if inferred.qname() == 'abc.abstractmethod':
-                        return next(node.infer_call_result(node))
+                        return next(node.infer_call_result())
             return None
         manager = builder.MANAGER