Btrfs: don't log error from btrfs_get_bdev_and_sb

Originally the message was not in a helper but ended up there. We should
print error messages from callers instead.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
[reworded subject and changelog]
Signed-off-by: David Sterba <dsterba@suse.com>