block: clean up the check in blkdev_iomap_begin()
It is odd to check the offset amidst a series of assignments. Moving this check to the beginning of the function makes the code look better. Signed-off-by: Li Nan <linan122@huawei.com> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20240625115517.1472120-1-linan666@huaweicloud.comSigned-off-by: Jens Axboe <axboe@kernel.dk>
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