btrfs: Make reada_tree_block_flagged private
This function is used only for the readahead machinery. It makes no sense to keep it external to reada.c file. Place it above its sole caller and make it static. No functional changes. Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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