Use folios throughout this function.  That removes the last caller of
huge_pagevec_release(), so delete that too.
Signed-off-by: NMatthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NChristian Brauner (Microsoft) <brauner@kernel.org>