UPSTREAM: io_uring: fix wrong arm_poll error handling

[ upstream commmit 9d2ad294 ]

Leaving ip.error set when a request was punted to task_work execution is
problematic, don't forget to clear it.

Fixes: aa43477b ("io_uring: poll rework")
Change-Id: I86efd5cf04d153f8eb600031ec951b0be060df51
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/a6c84ef4182c6962380aebe11b35bdcb25b0ccfb.1655852245.git.asml.silence@gmail.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>
[pavel: backport]
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 182dc3aa)
Bug: 268174392
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>