Remove double return statements (#5962)

Remove all the "double return" statements which were a result of us removing all the instances of

```
defer.returnValue(...)
return
```

statements when we switched to python3 fully.

1 files changed, 0 insertions, 1 deletions

diff --git a/synapse/api/auth.py b/synapse/api/auth.py

index fd3cdf50b0..ddc195bc32 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -704,7 +704,6 @@ class Auth(object):
                 and visibility.content["history_visibility"] == "world_readable"
             ):
                 return Membership.JOIN, None
-                return
             raise AuthError(
                 403, "Guest access not allowed", errcode=Codes.GUEST_ACCESS_FORBIDDEN
             )