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Currently the 'refs_to_add' argument of __btrfs_inc_extent_ref() always
matches the value of node->ref_mod, so remove the argument and use
node->ref_mod at __btrfs_inc_extent_ref().
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>