io_uring/futex: always remove futex entry for cancel all

io_uring/futex: always remove futex entry for cancel all

[ Upstream commit 30dab608c3cb99c2a05b76289fd05551703979ae ]

We know the request is either being removed, or already in the process of
being removed through task_work, so we can delete it from our futex list
upfront. This is important for remove all conditions, as we otherwise
will find it multiple times and prevent cancelation progress.

Cc: stable@vger.kernel.org
Fixes: 194bb58c6090 ("io_uring: add support for futex wake and wait")
Fixes: 8f350194d5cf ("io_uring: add support for vectored futex waits")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>