Use early return in lfs_token_check

lib/gitlab/auth.rb

@@ -113,7 +113,8 @@ module Gitlab
             User.by_login(login)
           end
 
-        if actor
+        return unless actor
+
         token_handler = Gitlab::LfsToken.new(actor)
 
         authentication_abilities =
@@ -125,7 +126,6 @@ module Gitlab
 
         Result.new(actor, nil, token_handler.type, authentication_abilities) if Devise.secure_compare(token_handler.value, password)
       end
-      end
 
       def build_access_token_check(login, password)
         return unless login == 'gitlab-ci-token'