[rpc] Avoid wireDeserializer overreading buffers by 1 byte (#36976)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/36976
The bounds check and the read were swapped in two places - I noticed
ASAN complaining in an unrelated change on an erroneous buffer.
Adding a couple simple test cases.
ghstack-source-id: 102606986
Test Plan: buck test mode/dev caffe2/test/cpp/rpc:
Differential Revision: D21148936
fbshipit-source-id: 7ec5007535f7310437ac1b9a72852a223b9dd29a
