btrfs: simplify code with bio_io_error

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: Guoqing Jiang <gqjiang@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/inode.c

@@ -8647,8 +8647,7 @@ static void btrfs_submit_direct(struct bio *dio_bio, struct inode *inode,
 	 * callbacks - they require an allocated dip and a clone of dio_bio.
 	 */
 	if (bio && dip) {
-		bio->bi_error = -EIO;
-		bio_endio(bio);
+		bio_io_error(bio);
 		/*
 		 * The end io callbacks free our dip, do the final put on bio
 		 * and all the cleanup and final put for dio_bio (through