filemap: remove page_endio()

page_endio() is not used anymore. Remove it.

Link: https://lkml.kernel.org/r/20230510124716.73655-1-p.raghav@samsung.com


Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>