btrfs: remove stale definition of BUFFER_LRU_MAX
Long time ago (2008), the extent buffers were organized in a LRU list and switched to rb-tree in 6af118ce ("Btrfs: Index extent buffers in an rbtree"). There was one stale macro definition left. Signed-off-by: NDavid Sterba <dsterba@suse.com>
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