proc/stat: switch to ->read_iter
Implement ->read_iter so that splice can be used on this file. Suggested-by:Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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