Variable 'blocksize' in reada_walk_down() is not used since commit
d3e46fea ("btrfs: sink blocksize parameter to readahead_tree_block").
This patch simply removes this variable.
Signed-off-by: NLuis Henriques <luis.henriques@canonical.com>
Reviewed-by: NDavid Sterba <dsterba@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>