io_uring: fix ignoring xa_store errors
xa_store() may fail, check the result. Cc: stable@vger.kernel.org # 5.10 Fixes: 0f212204 ("io_uring: don't rely on weak ->files references") Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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