Wang Shilong 1149ab6bd4 Btrfs: remove some BUG_ONs() when walking backref tree
The only error return value of __add_prelim_ref() is -ENOMEM,
just return errors rather than trigger BUG_ON().

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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