btrfs: add a helper to return a head ref
Simplify the error handling in __btrfs_run_delayed_refs by breaking out the code used to return a head back to the delayed_refs tree for processing into a helper function. Signed-off-by: Josef Bacik <jbacik@fb.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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