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btrfs: use rb_entry_safe() where possible to simplify code
Simplify conditionally reading an rb_entry(), there's the rb_entry_safe() helper that checks the node pointer for NULL so we don't have to write it explicitly. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: David Sterba <dsterba@suse.com>
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