io_uring: move send/recv IOPOLL check into prep
Fail recv/send in case of IORING_SETUP_IOPOLL earlier during prep, so it'd be done only once. Removes duplication as well Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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