The error flag is never tested for reiserfs folios, so stop setting it.

Cc: reiserfs-devel@vger.kernel.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20240530202110.2653630-12-willy@infradead.orgSigned-off-by: Christian Brauner <brauner@kernel.org>