bio_io_error was introduced in the commit 4246a0b6
("block: add a bi_error field to struct bio"), so use it to simplify
code.
Signed-off-by: NGuoqing Jiang <gqjiang@suse.com>
Reviewed-by: NDavid Sterba <dsterba@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>