btrfs: fix missing blkdev_put() call in btrfs_scan_one_device()

The function btrfs_scan_one_device() calls blkdev_get_by_path() and
blkdev_put() to get and release its target block device. However, when
btrfs_sb_log_location_bdev() fails, blkdev_put() is not called and the
block device is left without clean up. This triggered failure of fstests
generic/085. Fix the failure path of btrfs_sb_log_location_bdev() to
call blkdev_put().

Fixes: 1265925 ("btrfs: implement log-structured superblock for ZONED mode")
CC: [email protected] # 5.15+
Reviewed-by: Nikolay Borisov <[email protected]>
Signed-off-by: Shin'ichiro Kawasaki <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>

Author: kawasaki

fs/btrfs/volumes.c

@@ -1370,8 +1370,10 @@ struct btrfs_device *btrfs_scan_one_device(const char *path, fmode_t flags,
 
 	bytenr_orig = btrfs_sb_offset(0);
 	ret = btrfs_sb_log_location_bdev(bdev, 0, READ, &bytenr);
-	if (ret)
-		return ERR_PTR(ret);
+	if (ret) {
+		device = ERR_PTR(ret);
+		goto error_bdev_put;
+	}
 
 	disk_super = btrfs_read_disk_super(bdev, bytenr, bytenr_orig);
 	if (IS_ERR(disk_super)) {