io_uring: Fix leaked shadow_req
io_queue_link_head() owns shadow_req after taking it as an argument. By not freeing it in case of an error, it can leak the request along with taken ctx->refs. Reviewed-by: NJackie Liu <liuyun01@kylinos.cn> Signed-off-by: NPavel Begunkov <asml.silence@gmail.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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