filemap: Move 'filler' case to the end of do_read_cache_folio()

No functionality change intended; this simply moves code around to
disentangle the function a little.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-05-12 17:12:21 -04:00
commit 9bc3e86938