buffer: use b_folio in touch_buffer()
Removes a call to compound_head() in this path. Link: https://lkml.kernel.org/r/20221215214402.3522366-4-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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