splice: don't generate zero-len segement bvecs
iter_file_splice_write() may spawn bvec segments with zero-length. In preparation for prohibiting them, filter out by hand at splice level. Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NPavel Begunkov <asml.silence@gmail.com> Reviewed-by: NMing Lei <ming.lei@redhat.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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