Nobody checks the error flag on orangefs folios, so stop setting and
clearing it.  We can also use folio_end_read() to simplify
orangefs_read_folio().

Cc: Martin Brandenburg <martin@omnibond.com>
Cc: devel@lists.orangefs.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20240530202110.2653630-11-willy@infradead.orgTested-by: Mike Marshall <hubcap@omnibond.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>