io_uring: remove unused local list heads in NAPI functions

These lists are unused, remove them.

Signed-off-by: Olivier Langlois <olivier@trillion01.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/0a0ae3e955aed0f3e3d29882fb3d3cb575e0009b.1722294947.git.olivier@trillion01.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>