btrfs: opencode extent_buffer_get
The helper is trivial and we can understand what the atomic_inc on something named refs does. Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
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