io_uring: rename prev to head

Calling "prev" a head of a link is a bit misleading. Rename it

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2019-12-17 02:22:07 +03:00 • committed by Jens Axboe
commit 9d76377f7e