jfs: Remove use of folio error flag

Store the blk_status per folio (if we can have multiple metapages per
folio) instead of setting the folio error flag.  This will allow us to
reclaim a precious folio flag shortly.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>