Pull io_uring fixes from Jens Axboe:
 "One fix for a regression with poll in this merge window, and another
  just hardens the io-wq exit path a bit"

* tag 'io_uring-5.13-2021-05-22' of git://git.kernel.dk/linux-block:
  io_uring: fortify tctx/io_wq cleanup
  io_uring: don't modify req->poll for rw