don't return in __init__ functions (#60830)

Summary:
Fix some warnings from a code analyzer

Pull Request resolved: https://github.com/pytorch/pytorch/pull/60830

Reviewed By: jbschlosser

Differential Revision: D29433638

Pulled By: albanD

fbshipit-source-id: 148df1d8a0a79778f18e8b6abffbddef36c5031c

torch/autograd/function.py

@@ -99,7 +99,7 @@ class FunctionMeta(type):
         backward_fn = type(name + 'Backward', (BackwardCFunction,), {'_forward_cls': cls})
         cls._backward_cls = backward_fn
 
-        return super(FunctionMeta, cls).__init__(name, bases, attrs)
+        super(FunctionMeta, cls).__init__(name, bases, attrs)
 
 
 # mypy doesn't understand `with_metaclass` from torch._six

torch/fx/_symbolic_trace.py

@@ -71,7 +71,7 @@ class ProxyableClassMeta(type):
     """
     def __init__(cls, name, bases, attrs):
         _proxyable_classes.setdefault(cls)
-        return super().__init__(name, bases, attrs)
+        super().__init__(name, bases, attrs)
 
     def __call__(cls, *args, **kwargs):
         instance = cls.__new__(cls)  # type: ignore[call-overload]

torch/jit/_script.py

@@ -298,7 +298,7 @@ class ScriptMeta(type):
                     delattr(self, name)
 
         cls.__init__ = init_then_script  # type: ignore[misc]
-        return super(ScriptMeta, cls).__init__(name, bases, attrs)
+        super(ScriptMeta, cls).__init__(name, bases, attrs)
 
 
 class _CachedForward(object):