io_uring: fix submission-failure handling for uring-cmd
If ->uring_cmd returned an error value different from -EAGAIN or -EIOCBQUEUED, it gets overridden with IOU_OK. This invites trouble as caller (io_uring core code) handles IOU_OK differently than other error codes. Fix this by returning the actual error code. Signed-off-by: Kanchan Joshi <joshi.k@samsung.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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