btrfs: update and correct description of btrfs_get_or_create_delayed_node()
The comment mistakenly says the function is returning PTR_ERR instead of ERR_PTR. Fix it and update it so it's more descriptive. Signed-off-by:Charles Han <hanchunchao@inspur.com> Reviewed-by:
David Sterba <dsterba@suse.com> [ Enhance the function comment. ] Signed-off-by:
David Sterba <dsterba@suse.com>
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