btrfs: return void from readahead_tree_block
Errors in readahead are not fatal and ignored elsewhere in the code.
Signed-off-by: NDavid Sterba <dsterba@suse.cz>
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Errors in readahead are not fatal and ignored elsewhere in the code.
Signed-off-by: NDavid Sterba <dsterba@suse.cz>