UPSTREAM: io_uring: ensure that io_init_req() passes in the right issue_flags

We can't use 0 here, as io_init_req() is always invoked with the
ctx uring_lock held. Newer kernels have IO_URING_F_UNLOCKED for this,
but previously we used IO_URING_F_NONBLOCK to indicate this as well.

Fixes: cf7f9cd5 ("io_uring: add missing lock in io_get_file_fixed")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 937c15e2)
Bug: 268174392
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I762eacf1b49ca8a38d8b77c44db4ca2bc49b2c4c