filemap: Convert find_get_entry to return a folio
Convert callers to cope. Saves 580 bytes of kernel text; all five callers are reduced in size. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: William Kucharski <william.kucharski@oracle.com>
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