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Introduce bio_list_peek(), to obtain a pointer to the first bio on the bio_list without actually removing it from the list. This is needed when you want to serialize based on the list being empty or not. Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Acked-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>