bpo-37173: Show passed class in inspect.getfile error (GH-13861)

Currently, inspect.getfile(str) will report nonsense:

```pytb
>>> inspect.getfile(str)
TypeError: <module 'builtins' (built-in)> is a built-in class
```

This fixes that


https://bugs.python.org/issue37173

1 files changed, 3 insertions, 3 deletions

diff --git a/Lib/inspect.py b/Lib/inspect.py
index 91d209dc64..99a580bd2f 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -659,9 +659,9 @@ def getfile(object):
         raise TypeError('{!r} is a built-in module'.format(object))
     if isclass(object):
         if hasattr(object, '__module__'):
-            object = sys.modules.get(object.__module__)
-            if getattr(object, '__file__', None):
-                return object.__file__
+            module = sys.modules.get(object.__module__)
+            if getattr(module, '__file__', None):
+                return module.__file__
         raise TypeError('{!r} is a built-in class'.format(object))
     if ismethod(object):
         object = object.__func__